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In this section:

Table of Contents
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Note

Not applicable to SBC CNe Edge and 1K2K.


Creating a SIP Signaling Group

Create a SIP Signaling Group:

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Managing SIP Signaling Groups
Managing SIP Signaling Groups
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Modifying a SIP Signaling Group

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Configuring a SIP Signaling Group

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Prerequisites
:

Create the following configuration resources used for the SIP Signaling Group directly from the SIP Signaling Group screen, by clicking the 'Image Modified' icon for the field in theWebUI: 


Info
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Field Definition List
Field Definition List

Field definitions for the Create SIP Signaling Group window are listed by feature.

Quick Links - Configuration Options by Feature

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Configure a SIP Signaling Group:

  1. From the Create Signaling Group drop-down box, select SIP Signaling Group.

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    1Create Signaling Group
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    Signaling groups types are supported according to product:

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    0Figure1


    Signaling Group - Support Types

    Signaling Group TypeSupported in SBC EdgeSupported in SBC SWe LIte
    ISDN(tick)(error)
    SIP(tick)(tick)
    CAS(tick)(error)


  2. Configure the field options. Field definitions below are listed in SIP Signaling Group feature groups. See Quick Links - Configuration Options by Feature.

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    1Create Signaling Group
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Overview - Field Definitions

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1SIP Signaling Group - Overview

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Description

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FieldDescription
Description
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Descriptive name for the signaling group.
Admin State
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Specifies the admin state of the Signaling group.

  • Enable: Enables the signaling group.
  • Disable: Disables the signaling group.
  • Drain: When Drain is selected, calls that are currently up remain connected. However, new calls and forking are not allowed for the Signaling Group. This allows all the calls to be drained from the SG.


SIP Channels and Routing - Field Definitions

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1SIP Signaling Group - SIP Channels and Routing

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FieldDescription
Action Set Table
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Specifies a defined Action Set Table for this Signaling Group.
Call Routing Table
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Specifies the Call Routing Table this Signaling Group uses.
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Number of Channels
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Specifies the number of SIP channels available for calls in this Signaling Group.

For 

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. Valid entry: 1 - 960.

For

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. Valid entry: 1 - 960.

SIP Profile
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Specifies the SIP Profile to use for this Signaling Group
SIP Mode
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Specifies the SIP Registration Mode to use in this Signaling Group.

    • Basic Call: Sends INVITEs to the selected server table.
    • Forward Reg. After Local Processing: Forwards the REGISTER request after inserting it to the local registrar.
    • Local Registrar: Maintains local registrar only. Uses registrar bindings to terminate a call.
Note

If Fwd. Reg. After Local Processing is configured as the SIP Mode, the selected SIP Server Table for that same Signaling Group should not be configured with a Contact Registrant Table. The SBC does not support Fwd Reg. After Local Processing and a Contact Registrant Table in the same Signaling Group.

See also: Configuring the SBC Edge for Site Survivability.

Agent Type
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Specifies the way in which SIP-SIP signaling will be handled by the SBC. Valid entries:

Back-to-Back User Agent. The SBC will maintain state and participate in all SIP signaling between both endpoints. 

Access Mode: When AccessMode is enabled, the SBC allows certain SIP functions to be sent in passthrough mode:

    • Non-call related methods (Register, Subscribe and Notify)
    • Refer and Update
    • Authentication handling

When Agent Mode is set to Access Mode, the Signaling Group service status will always show as "green" or "up" to allow for pass through messaging. Also, when Agent Type is set to Access Mode, the options Office 365 and Office 365 with AD PBX are disabled.

Default selection: Back-to-Back User Agent.

Note
titleAccess Mode SG Requirement

 If Access Mode is specified, a source and destination signaling group must exist (e.g., Broadsoft Local Register SG to Broadworks Server SG).

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Interop Mode
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Indicates if the SBC should interoperate in a proprietary manner for certain functionality. Multiple SIP Signaling Groups can enable this mode, but this mode can only be enabled once for each SIP Signaling Group/SIP Server combination.

Valid entries:

Standard. SBC will interoperate according to RFC standards.

BroadSoft Extension. SBC will support BroadSoft related extensions. Specifically, the SBC will use BroadSoft’s subscriber data (BroadWorksSubscriberData) while in remote survivability mode. This feature allows the SBC to retrieve and store alternative user information for use when the BroadSoft server is unreachable.

Office365. Indicates the Signaling Group is communicating directly with the Skype for Business Front End Pool. Applicable to SBC 1000/2000 only.

Office 365 w/AD PBX. Indicates the Signaling Group is communicating directly with the Skype for Business Front End Pool. The SBC retrieves AD records (based on the entry in the AD Attribute field) and uses that to register on-premises PBX endpoints to Skype for Business Front End Pool. Applicable to SBC 1000/2000 only.

Default entry: Standard.

Note

When the Agent Type is set to Back-to-Back User Agent, the BroadSoft Extension option is not available.


Office 365 User Domain Suffix
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Note: This field is applicable to SBC 1000/2000 only.

The FQDN used in the Signaling Group to communicate directly with the Skype for Business Front End Pool.

This field is visible when the Interop Mode is set to Office 365 or Office 365 w/AD PBX.

This field can be NULL; if so, the address of the SIP Server will be used.


Registrant TTL
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Specifies the Time-To-Live (TTL) value for inbound registration. Inbound registration values should be equal to or greater than this. Valid entry: Enter a value in seconds. Default value: 3600.

This field is visible when the Agent Type is set as Access Mode.

AD Attribute
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This field is applicable to SBC 1000/2000 only.


Specifies any desired Active Directory attribute name in which the PBX number to be Registered is located; this field is dependent on how AD is configured. Default entry: =pager=.

This field is visible when Interop Mode is set as Office 365 w/AD PBX.


AD Update Frequency
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This field is applicable to SBC 1000/2000 only.

Controls the frequency (in days) for how often SIP queries Active Directory for all records with the specific AD attribute populated. Valid entry: 1 - 30 days.

This field is visible when Interop Mode is set as Office 365 w/AD PBX.


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As an option, the AD Live Update feature forces the SBC to query AD directly to obtain updated records (rather than following the parameter set in the AD Update Frequency).


AD First Update Time
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Note
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This field is applicable to SBC 1000/2000 only.

Specifies time of first AD query update in hh:mm:ss (24-hour format). Valid entry: hh (hour), mm (minute), ss (seconds).

This field is visible when Interop Mode is set as Office 365 w/AD PBX.


Registrar

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Specifies the Registrar Table attached to the Signaling Group for routing purpose and adding registration records.
Registrar Min. TTL
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Specifies the Time-To-Live (TTL) value for inbound registrations. Inbound registration values should be equal to or greater than this. This is configured in all registration scenarios.
Outbound Registrar TTL
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Specifies the Time-To-Live (TTL) value for outbound registrations. This is configured only in the Forward modes of operation only.
SIP Server Table
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Specifies the SIP Server Table to be used in the Signaling Group. The options in this field are derived from the configuration of SIP Server tables, see Creating and Modifying Entries in SIP Server Tables.

If a SIP Server Table is added which includes a server that has Stagger Registration enabled, Stagger Registration occurs. Also, if a SIP server table is removed which included a server that had Stagger Registration enabled, Stagger Un-registration occurs. For more information about Stagger Registration, see Creating and Modifying Entries in SIP Server Tables .

If you select an entry in the SIP Server table that is defined as DNS SRV, the Load Balancing field is not visible. See Load Balancing.

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Load Balancing
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Specifies the load balancing method used for SIP Server registration and redundancy in the Signaling Group.

    • Round Robin: Each initial INVITE sent to the next SIP Server in the pool. As the basic algorithm, the scheduler selects a resource pointed to by a counter from a list, after which the counter is incremented and if the end is reached, returned to the beginning of the list. Round-robin selection has a positive characteristic of preventing starvation, as every resource will be eventually chosen by the scheduler.
    • Priority: Register All. The request goes to the SIP Server with the highest priority (this is configured in the SIP Server) as long as it is available.
    • Priority: Register Active Only: Used with the Failover SIP Registration feature. The initial request goes to the SIP Server with the highest priority. If the registration fails, the SIP Server becomes unreachable, or the registration expires and a re-register fails, the SBC falls back to the next available SIP Server.
    • First
.
    • : The initial request goes to the first available server.
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For the Failover SIP Registration feature, the following options must be enabled:

    • The Priority: Register Active Only must be selected in Load Balancing.
    • The Use Register as Keep Alive field must be enabled in the SIP Signaling Group.

The type of the SIP Server: IP/FQDN or DNS-SRV determines the available options for Load Balancing:

Load Balancing OptionIP/FQDNDNS-SRV
Round Robin(tick)(error)
Priority: Register All(tick)(tick)
Priority: Register Active Only(tick)(tick)
First(tick)(error)


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In the SIP Server configuration, the Priority configuration option determines the order in which a SIP Server is used for redundancy and registration. Refer to Creating and Modifying Entries in SIP Server Tables.


Channel Hunting
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Specifies the method that Call Control uses to allocate SIP channels.

    • Standard: Specifies the first available low-numbered channel.
    • Reverse Standard: Specifies the last available high-numbered channel.
    • Round Robin: Specifies channels based on next available from low numbered to high numbered.
    • Least Idle: Specifies that channels are chosen based on the least idle channel.
    • Most Idle: Specifies that channels are chosen based on the most idle channel.
Notify Lync CAC
Profile PanelbgColor#FAFAFAborderStylenone
ProfileEnables whether any CAC Profile updates received locally are transmitted to the SIP servers listed in this Signaling Group Configuration. Valid entry: Enable (Default, updates received locally are transmitted to SIP servers), or Disable (updates received locally are not transmitted to SIP servers).
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Challenge Request
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Indicates whether or not incoming request messages are challenged for security purposes. If this option is set to Enable, you must specify a realm and at least one entry in the Authorization Table.

    • True: All requests are challenged for the realm, user, and password.
    • False: No request messages are challenged.
Outbound Proxy
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Specifies the outbound proxy through which all SIP messages are sent. For in-depth configuration detail, see Outbound Proxy Configuration.
Outbound Proxy Port
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Specifies the port number for the outbound proxy, if one is configured. The port number must be in the range 1024 through 65535.
No Channel Available Override
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Note

This field is applicable to SBC 1000/2000 only.

In the event of a call release due to the No Channel/Circuit available release cause code, the specified cause code is sent to the relevant protocol module. For more information, refer to the list of Cause Codes.

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:

This attribute should be applied to the inbound Signaling Group of calls. Even in the case of an outbound Signaling Group having no channel available, the parameter value on the inbound Signaling Group is used to determine the cause code to send.

See below for an example of this behavior:

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1Example - No channel Available Override

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Call Setup Response Timer
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Specifies the interval of time, in seconds, after a call is initiated that the

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Call Proceeding Timer
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Timer indicates the amount of time to wait after receiving a “100 Trying” for a call attempt (egress INVITE). When the timer expires the call will not proceed.

Option: 24 - 750 seconds.

QoE Reporting
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This field is applicable to SBC 1000/2000 only.

Enables the QoE (Quality of Experience) reporting feature in the SBC. Valid options: Enabled (enables the feature) or Disabled (disables the feature). This field must be enabled for the QoE options to be available through the QoE Settings. See Configuring Quality of Experience (QoE) Settings

Use Register as Keep Alive
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Use Registration requests as Keep Alive for marking the Signaling group as up or down. Default entry: Enabled.

When this field is set to Disabled, only SIP Options (if configured) are used as a keep-alive mechanism to mark the Signaling group as up or down.

Forked Call Answered Too Soon
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When enabled, the SBC Edge ignore a forked leg (disconnect) if that leg is going to a voicemail box, but the rest of the forked legs may connect to the subscriber's other numbers. For details, refer to Forked Calls Answered To Soon (Disconnect on Quick Connect).

Possible entries:

    • Enabled: The forked leg is ignored (disconnected) if that leg is going to a voicemail box, but the rest of the forked legs may connect to the subscriber's other numbers.
    • Disabled. The forked leg is not ignored (disconnected) if that leg is going to a voicemail box.
Answer Too Soon Timer
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This field is available only when Forked Call Answered Too Soon is Enabled.

Specifies the timer for the forked leg to be disconnected. Valid entry: 1 - 5000 ms.

SIP Recording Status
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For SIPREC, enables or disables the SIP Recording functionality on the selected signaling group.

Select from the drop down list.

    • Enabled
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    • : Enables voice recording on the selected Signaling Group.
    • Disabled
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    • : Disables voice recording on the selected Signaling Group.
SIP Recorder
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When SIPREC is enabled for the specific Signaling Group, this field enables the selection of an entry from a SIP Recording Table.  Select from the drop down list. This list is populated from the entries configured in the SIP Recording table. For details, refer to Creating and Modifying Entries in the SIP Recorder Table.

This field is available only when SIPRecording Status is set to Enabled.



Media Information - Field Definitions

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Media Information - Field Definitions

Caption0Figure1SIP Signaling Group - Media Information

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FieldDescription
Supported Audio/Fax Modes


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Note

This field available is for SBC 1000/2000 only. For SBC SWe Lite, see Supported Audio Modes.

Determines the streaming mode for audio, fax, and media transmission.

    • DSP: Audio/fax stream is processed using a DSP resource, and consumes a DSP license.
    • Proxy: Audio/fax stream is processed using the SBC internal processing resources and does not require a DSP resource or license.
    • Direct: Audio/fax stream is passed directly from one compatible end-point to another, this uses neither the SBC processor or a DSP resource.

All options are enabled by default.

Supported Audio Modes
note


Info
titleNote

This field available is for SBC SWe only. For SBC 1000/2000 see Audio/Fax Stream Mode.


Determines the streaming mode for audio, fax, and media transmission.

    • DSP: Audio stream is processed using a DSP resource, and consumes a transcoding license if the codecs are different.
    • Proxy Relay: Audio stream is processed using the SBC internal processing resources and does not require a DSP resource or transcoding license. Refer to Working with Licenses. SRTP is untouched locally by the SBC.
    • Proxy with Local SRTP. Media stream is switched between endpoints using SRTP media encryption on a call leg basis. Note: Support of Proxy with Local SRTP (encryption/decryption) requires licensing up to 1,000 signaling sessions. See Working with Licenses.
    • Direct: Audio stream is passed directly from one compatible end-point to another, using neither the SBC processor nor a DSP resource.

All options are enabled by default.

Supported Video/Application Modes

Determines the streaming mode for audio, fax, and media transmission. This feature requires a video license.

    • Proxy: the video/application stream is processed using the SBC internal processing resources.
    • Direct: the video/application stream is passed directly from one compatible end-point to another; this operation uses neither SBC processor.
    • Disabled: the route is not used for video calls.

The first two options are enabled by default.

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Media List IDSpecifies the Media List used by this Signaling Group.
Proxy Local SRTP Crypto Profile ID


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Note

Available for SBC SWe Lite only. This field is available only when Proxy with Local SRTP is included in the Supported Audio mode list. 

Determines whether a call crypto file is used with SRTP media negotiation.

    • Crypto File
.
    • : Indicates the crypto file profile used to negotiate SRTP.
    • None
.
    • : SRTP is not used for media negotiation.
Play Ringback
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Specifies how ringback plays on a channel.

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false
Note

The Play Ringback configuration functions with 180 Ringing or ISDN Alert. The function also executes when SIP 183 is received with Session Description Protocol (SDP).

  • Auto on 180 (applies to 180/Alert only) or Auto on 180/183 (applies to 180/Alert and 183/Progress): Configured for Auto, the SBC operates in the nominal RFC 3960 pattern
    • SBC generates ringback until in-band media arrives.
    • SBC-generated ringback is discontinued in the presence of in-band ringback.

    • Additionally, any ALERT is sent with PI=8 regardless of whether or not an SDP was received on the SIP side. Doing so allows the SBC to send in-band audio without signaling PROGRESS.

Toggle Cloak
idPlayRingBackAuto
Click to see more information about this topic.

Cloak
idPlayRingBackAuto


Example diagrams below refer to 180/Alert message.


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Auto — SIP ↔ SIP


Auto — SIP/ISDN ↔ ISDN




  • Always on 180 (applies to 180/Alert only) or Always on 180/183 (applies to 180/Alert and 183/Progress): SBC provides ringback, ignoring any arriving in-band media.
    • For SIP-originated call legs, 180 is sent to permit SBC to provide in-band ringback via early media.

    • For ISDN-originated call legs, ALERT+PI will be sent along with SBC-inband ringing.

Toggle Cloak
idPlayRingBackAlways
Click to see more information about this topic.

Cloak
idPlayRingBackAlways


Example diagrams below refer to 180/Alert message.


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Always — SIP ↔ SIP


Always — SIP/ISDN ↔ ISDN




  • Never: SBC does not provide ringback and cuts through ringback from the source when/if it arrives.
    • With NEVER, SBC will send 180/ALERT to the originating call leg without SDP/PI as in this configuration SBC will not supply inband ringback.

Toggle Cloak
idPlayRingBackNever
Click to see more information about this topic.

Cloak
idPlayRingBackNever


Example diagrams below refer to 180/Alert message.


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Never — SIP ↔ SIP


Never — SIP/ISDN ↔ ISDN




(info)Note: The Play Ring Back setting is activated only after the channel receives an ALERT or 180 Ringing. Issues with ringback and 183 Session Progress must be addressed using a Message Translation.

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Click to see more information about Activating Play Ring Back.

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idPlayRingBackActivation

The Ringback setting will be activated if a Message Translation's output is ALERT/180.

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The Ringback setting is not used for ISDN-to-ISDN calls when the ALERT contains a Progress Indicator. SBC will always set the outgoing PI as it was received.

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Tone Table

Specifies whether a congestion tone plays when a 503 response with reason header Q.850 and cause code = 42 is received for outbound INVITE.

Options: Enable (congestion tone is plays) or Disable (default; congestion tone does not play).

Play Congestion Tone

Specifies whether a congestion tone plays when a 503 response with reason header Q.850 and cause code = 42 is received for outbound INVITE.

Options: Enable (congestion tone is plays) or Disable (default; congestion tone does not play).

Early 183

Specifies whether to send a SIP 183 response immediately after receiving an Invite message. The early 183 Session Progress with SDP provides the SRTP key that will be used to decrypt the transmit stream from SBC to the SIP peer. This setting is used to prevent the peer device (e.g. Mediation server) from staying in the Trying state. This setting is required for Lync 2010/2013 Skype for Business interoperability.

Early 183 is applicable only when Audio/Fax Stream DSP Mode is enabled as the media mode.

Allow Refresh SDPSpecifies whether to allow refresh SDP after the media has been negotiated. Options: Enable (enables SDP after negotiation) or Disable (does not allow SDP after negotiation). Default entry: Enable.
Music on Hold

The field enables Music on Hold at the SIP Signaling group level. Available options:

    • Always Enabled: Enables local Music on Hold (for SDP attribute “sendonly” or “inactive”).
    • Enabled for SDP Inactive: Enables local Music on Hold when there is no possibility of the peer device sending its own music during hold (for SDP attribute “inactive”).
    • Disabled: Disables Music on Hold for the SIP Signaling Group.

Default value: Disabled.

For detailed information about enabling Music On Hold as part of the Media configuration, see Configuring the Media System. For detailed information about uploading music files, see Uploading Music on Hold Files - SBC Edge.

RTCP Multiplexing


Info
titleNote

For details on how to use Real-Time Transport Control Protocol (RTCP) Multiplexing with Microsoft Teams Direct Routing, refer to Best Practice - Configuring Carriers for Microsoft Teams Direct Routing.

Enables RTCP Multiplexing to combine two parts of the Real-Time Transport Protocol (RTP) for data traffic and RTCP (for control information) onto a single multiplexed UDP port. RTCP Multiplexing is supported according to RFC 5761, in which the SDP contains the value of a=rtcp-mux. RTCP Multiplexing is supported for DSP mode only.

Valid entries: Enable (SDP contains an a=rtcp-mux attribute, and RTP and RTCP are able to be combined on a single multiplexed port if the far end is capable) or Disable (SDP does not contain an a=rtcp-mux attribute and RTP and RTCP consume two ports).

Default value: Disable.

Note

The peer endpoint must support the a=rtcp-mux exchange for the RTP and RTCP port multiplexing onto one data port.


Media Codec

Latch 

Latch

Available_since
TypeAvailable Since
Release9.0.7

Media Codec Latch allows enabling or disabling of the codec lockdown when receiving multiple codecs in offer answer model.

When disabling Media Codec Latch, the SBC will not renegotiate the codec if the peer sends more than one codec in the answer. 

Valid entries: Enable or Disable

Default value: Enable


Mapping Tables- Field Definitions

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SIP
Description
SIP To Q.850 Override Table
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Specifies the SIP to Q.850 Override Table to use for this Signaling Group.
Q.850 To SIP Override Table
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Specifies the Q.850 To SIP Override Table to use for this Signaling Group.
Pass-thru Peer SIP Response Code
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The default value is Enabled. If you disable the pass-thru peer SIP response, then the mapping tables will be applied to SIP-SIP calls.


SIP IP Details - Field Definitions

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FieldDescription
Teams Local Media Optimization
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Microsoft Teams Direct Routing media flow uses the shortest path to improve the SBC Edge's media quality and bandwidth usage.
Signaling/Media Source IP 
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NOTE:

Specifies the Logical IP address at which SIP messages are received. This address is used as the source IP for all SIP messages leaving the SBC SWe Lite or SBC 1000/2000 through this Signaling Group. The physical interface on which these messages leave the system is determined by the System IP routing configuration. The IP version (IPv4 or IPv6) for the SIP Server used by this Signaling Group determines the IP version used for all outgoing messages leaving the SBC through this Signaling Group.

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If Static NAT is used, the configured NAT Public IP replaces the Source IP selected or acquired when set to Auto mode. When the Outbound NAT Traversal field is set to Static NAT, the name of the  Signaling/Media Source IP option changes to Signaling /Media Private IP. 

    • Auto:
 
    • The node automatically selects the IP address used as the source address of all outgoing SIP messages leaving the SBC through this Signaling Group. The IP address is based on the physical interface selected by the IP routing configuration.
    • Ethernet IP: Allows you to select a specific source IP address for outgoing SIP messages through this Signaling Group.
Private Media Source
IP  PanelbgColor#FAFAFAborderStylenone
IPPrivate IP address that handles routing of messages for media. This field is displayed only when Teams Local Media Optimization is enabled. Valid entry: select an IP address from the drop down list. 
Signaling DSCP
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Each SIP-SG is configurable with the DSCP value to be used for signaling. This allows for improved quality of service in real-time applications, such as conferencing and conversations. The settings take effect for both client and server modes of SIP. The default value of 40 is the most common value used in the VOIP networks for signaling packets. The configured value should be chosen according to the QoS policies of the IP network in which the signaling packets travel.

Valid entry range: 0 to 63 (inclusive). Default value: 40.

NAT Traversal
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Specifies whether or not the Signaling Group uses a third-party entity IP address inside SIP message to support network address translation (NAT). Only visible when NAT Traversal is set to Static NAT.

    • None: Specifies that network address translation is not used.
    • Static NAT: Specifies that network address translation is used.
Note

Symmetric NAT (port forwarding) is the only supported NAT type. This NAT configuration type means that packets received on a specific NAT server port are always forwarded to the same SBC port, for example, packets on the NAT public IP, port 5060 are forwarded to a private (SBC) IP, port 5060.


ICE Support
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Specifies whether ICE support is enabled/disabled. Enable/disable is displayed only when SIP Mode is configured to Basic Call.

    • Enable: When ICE support option is enabled on the signaling group, SBC Edge allows SIP to propose ICE candidates in INVITE and 183/200 responses based on the call direction for that Signaling Group. If no candidate is proposed by the other side, the call proceeds as if ICE was not enabled.
    • Disable: When the ICE Support option is disabled, the SBC Edge does not support ICE for both incoming and outgoing calls. If ICE is disabled on a Signaling Group and if the incoming offer contains ICE, the SBC Edge responds with no ICE attributes in the SDP.
Note

When Interactive Connection Establishment (ICE) support is enabled, it takes precedence over all other media related NAT configuration.

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ICE Mode
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Specifies the Interactive Connection Establishment (ICE) Mode that is enabled/disabled. This field is displayed only when ICE Support is enabled.

For SBC 1000/2000:

Two ICE Modes are available:

    • Lite
. The
    • : The SBC operates as an ICE-Lite agent endpoint (for SIP calls involving NAT devices) with a full ICE agent in the role of controlling agent. 
    • Full
.
    • : The SBC operates as an ICE (full) agent endpoint. 


For SBC SWe Lite:
    • Lite: For the SBC SWe Lite, only Lite mode is supported. The SBC operates as an ICE-Lite agent endpoint (for SIP calls involving NAT devices) with a full ICE agent in the role of controlling agent. 
 
For details on ICE, refer to Working with the SBC Edge and SWe Lite as an ICE-Lite Agent and Working with the SBC Edge as an ICE Agent.


Static NAT - Outbound

If the selected Outbound NAT Traversal is Static NAT, you must enter the

field NAT Public IP (Signaling/Media) appears.

field NAT Public IP (Signaling/Media) appears.

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Static NAT - Inbound

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Detection
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1Static NAT - Outbound
3Static NAT - Outbound

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Static NAT - Inbound 

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1SIP Signaling Group - Inbound NAT Traversal

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Field Definitions

Detection

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Enables and disables NAT Traversal detection for inbound SIP/RTP packets.

    • When detection is disabled, none of the following fields are visible.
Qualified Prefixes Table
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Specifies which SIP NAT Qualified Prefix Table to use in association with this SIP Signaling Group. The Qualified Prefixes Table is used to determine whether or not a particular subnet is behind a NAT device. If None is selected from the Qualified Prefixes Table drop-down list, then all subnets are treated as if they were behind a NAT device. The options available from this drop-down list are configured as part of NAT Qualified Prefixes. 

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Secure Media Latching
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Enables and disables Secure Media Latching for inbound RTP packets. When enabled, media latching occurs only if the RTP packet's IP is in the same subnet as the public IP seen by SIP signaling. When disabled, no IP address security checks are performed during RTP latching.
Source Media
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Netmask

Specifies netmask used to compare the SIP Signaling IP and the RTP IP used for latching.

    • The Source Media Netmask field is present if Inbound NAT Transversal Detection and Secure Media Latching are enabled.
    • The netmask must be specified in dotted decimal format (e.g., 255.255.255.255).
Registrar Max. TTL Enabled
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Enables and disables the time to live (TTL) functionality for inbound registrants from behind a NAT. If a client registers with an expires value greater than the value specified in the Registry Max. TTL field, the expiration is adjusted to the value specified in the Registrar Max TTL field.
Registrar Max. TTL
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Specifies a maximum time to live (TTL) for the SIP registration. The SBC uses this feature to determine that the client is still active, and aid in keeping bindings to remote NAT devices alive. If the SBC does not receive a request to re-register from the client before the expiry, the call and the registration are torn down.

    • Note that this field is only applicable to clients registering from behind NAT devices.
    • Setting the Max. TTL to a low duration may result in excessively high system resource usage as the number of NAT clients increases.
Application Layer IP
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Specifies how the Signaling Group will select the local IP.

    • Auto: Means that the SBC connects to the peer and queries the local IP which is used in SIP headers and SDP.
    • Bind: Binds to a specified interface and uses that IP address (1st/2nd) in headers and SDP.
NAT Public IP Address

Specifies the public IP of the NAT server visible from Internet. The NAT server's ports must be configured to allow SIP and RTP traffic, for example: port range 5060-5061 for SIP and 16000-17000 for RTP.

The IP address specified in this field must be publicly accessible.

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Listen Ports - Field Definitions

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This section defines a listening port and protocol for the SIP Signaling Group.

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For the SfB to Microsoft Teams migration, do not configure the Listen Ports table of the SfB signaling group with the same Listen Ports of the Microsoft Teams signaling group.

Port


Field
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Description
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PortSpecifies the port to listen for SIP messages.
Protocol
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Specifies the protocol with which this port can receive SIP messages.
TLS Profile
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If TLS is selected this specifies the TLS Profile that the TLS port uses for secure SIP messages.

Note: When several TLS Signaling Groups are all listening on the same port (for example, 5067), you must use the same TLS profile. If you need different TLS profiles, the Signaling Groups must listen on a different port.

Federated IP/FQDN - Field Definitions

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titleNote

Federated IP addresses and FQDNs specified in a SIP Signaling Group are whitelistedpermitted.

The Federated IP/FQDN feature acts as an access control by defining from which server a SIP Signaling Group will accept messages. 

FieldDescription
IPv4/6 Address or FQDN
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Specifies the IP Address (IPv4 or IPv6) or Fully Qualified Domain Name of a server from which the SBC will accept SIP messages. Federated IP allows IPv4, IPv6, or FQDN address format.

For IPv4:

  • If the Netmask is not specified, 255.255.255.255 is used.
  • When an IP Address is specified the Netmask is mandatory.

For IPv6:

  • Prefix format is used to identify the subnet.

For FQDN:

  • When an FQDN is specified, all the IPs in that domain are added.
  • Uses the Federated IP Netmask/Prefix field to determine whether the signaling group uses IPv4 or IPv6.
Federated IP Netmask/Prefix
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For IPv4: Specifies the network address mask to apply against the specified server address.

For IPv6: Specifies the prefix to identify the subnet.


Message Manipulation - Field Definitions

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Message Manipulation

This option enables or disables the ability for the SBC to manipulate SIP messages using previously configured Message Tables.

Select from the drop-down list: Enable (enables the feature) or Disable (

disables the feature).

disables the feature).

Inbound Message Manipulation

Inbound Message Manipulation - Field Definitions

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The rules in this table are used to manipulate inbound SIP messages in the Signaling Group. The Signaling Group will support a maximum of 10 Message Rule Tools allowed in the Signaling Group (inbound direction).

    • Up
.
    • : Moves the message table entry up in the list.The rules are applied in the order the tables are listed.
    • Down
. Moves
    • : Moves the message table entry down in the list.The rules are applied in the order the tables are listed.
    • Add
.
    • : Displays a drop-down list of available message tables. Select an entry and click Apply.
    • Remove
.
    • : Removes the message table entry from the list.
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Outbound Message Manipulation
- Field Definitions
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The rules in this table are used to manipulate outbound SIP messages in the Signaling Group. The Signaling Group will support a maximum of 10 Message Rule Tools allowed in the Signaling Group (outbound direction).

    • Up
.
    • : Moves the message table entry up in the list. The rules are applied in the order the tables are listed.
    • Down
.
    • : Moves the message table entry down in the list.The rules are applied in the order the tables are listed.
    • Add
. Displays
    • : Displays a drop-down list of available Message Tables. Select an entry and click Apply.
    • Remove
.
    • : Removes the message table entry from the list.
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