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

Quick Links - Configuration Options by Feature

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.

Specifies a defined Action Set Table for this Signaling Group.

Specifies the Call Routing Table to be used by this Signaling Group.

Specifies the number of SIP channels available for calls in this Signaling Group.

Specifies the SIP Profile to use for this Signaling Group

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.

See also: Configuring the SBC Edge for Site Survivability.

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 a pass through 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.

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. The SBC will interoperate according to RFC standards.

BroadSoft Extension. The 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.

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. 

Header Transparency. Indicates the SBC passes through all non-dialog related SIP headers from any inbound SIP messages to the outbound messages.(If this field is configured as Broadsoft Extension, the SBC passes through only the SIP headers required by Broadsoft from inbound SIP messages to outbound SIP messages).

Default entryDefault entry: Standard.

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.

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

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

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.

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.

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.

Specifies the Registrar Table attached to the Signaling Group for routing purpose and adding registration records.

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.

Specifies the Time-To-Live (TTL) value for outbound registrations. This is configured only in the Forward modes of operation only.

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.

This field applies only when the SIP Server Table selected from the drop down list is IP/FQDN based and does not contain SRV servers (load balancing is not required if the SIP Server Table which contains a SRV server). See SIP Server Table.

Specifies the load balancing method used with this Signaling Group. Used only in the SIP Basic Call Mode.

• Round Robin: Each initial INVITE sent to the next 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: The request goes to the server with highest priority.
• First: The initial request goes to the first available server.

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

• Standard: Specifies the first available low numbered channel.
• Reverse Standard: Specifies 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.

Enables 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) .

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 realm, user, and password.
• False: No request messages are challenged.

Specifies the outbound proxy through which all SIP messages are sent. For in-depth configuration detail, see Outbound Proxy Configuration.

Specifies the port number for the outbound proxy, if one is configured. The port number must be in the range 1024 through 65535.

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

NOTE: This attribute relates only to Inbound calls on the Signaling Group where applied.

Specifies the interval of time, in seconds, after a call is initiated that the

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.

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

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

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

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

All three options are enabled by default.

Determines the streaming mode for audio, fax, and media transmission. This feature requires 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 uses neither the SBC processor.

Both options are enabled by default.

Specifies the Media List used by this Signaling Group.