In this section:


IMPORTANT

Ribbon recommends using the Transparency Profile to configure transparency on the SBC Core for new deployments, as well as applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.

Refer to the SBC SIP Transparency Implementation Guide for additional information.

Use the Flags window to configure IP attribute flags within an IP signaling profile. Different sets of flags apply to H323 and SIP trunk groups.

To View and Edit Flags

On the SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > IP Signaling Profile > Common IP Attributes > Flags. 

H323 Flags

On the Flags window, choose the IP Signaling Profile as DEFAULT_H323 to view the flags for H323 trunk groups.

The Edit Flags window opens showing flags that apply to H323 trunk groups.

Figure 1: Trunk Provisioning - Common IP Attributes H323 Flags


H323 Trunk Group Flags

Parameter

Description

Audio Codec Change Through Empty Tcs

Enable flag to perform audio codec change (e.g. G.711 fax fallback) using empty Terminal Capability Set (TCS). When disabled, the SBCperforms audio codec change using request mode.

  • Disable (default)
  • Enable
Clearmode For Data Calls

This parameter is used to enable the clearmode function for data calls. When enabled, the SBC enables clearmode. When disabled, the SBC provides legacy G.711 behavior.

  • Disable (default)
  • Enable
Disable Constrained Capacities

Set this flag to present a full TCS to its peer during call setup or media modification. When disabled, the SBCpresents only the selected codec in the TCS, and follows up with a full TCS after media establishment.

  • Disable (default)
  • Enable
Include G729With G729a When Offer Psp Has G729a

Use this flag to control whether the H.323 Service Group includes G.729 along with G.729A in the network offer when the SBCoffer Packet Service Profile has G.729A.

  • Disable (default)
  • Enable
Map Dpm To Sendrecv For Initial Dialog

When this parameter is enabled, direction attribute a=sendrecv is sent in the outgoing initial invite when a=inactive is received in the Invite from other side, or a=sendrecv is sent in responses to initial invite when the response from other side is received with a=inactive.

  • Disable (default)
  • Enable
Send Empty Tcs

Enable this flag to send an empty TCS to the peer to restart the peer’s forward channel if there is an address update in a direct media case.

  • Disable (default)
  • Enable
Send RTCP Port In SDP

When enabled, the SBC adds the attribute,a=rtcp:<rtcpPort> to the audio and video m-lines in the outgoing SDP (RTCP port mentioned will be the SBC RTP port + 1). When disabled, the SBC does not add the attribute a=rtcp:<rtcpPort> to the audio and video m-line in the outgoing SDP.

  • Disable (default)
  • Enable
Select Core Stream For Multi Stream Audio Or Image Call

When enabled, the SBC selects the core stream based on the Route PSP from multiple audio or image streams received in the incoming offer. The dependent flag Disable Non Core Audio And Image Streams is visible for configuration only when this flag is enabled.

  • Disabled (default)
  • Enabled
Disable Non Core Audio And Image Streams

This dependent flag is visible only when the flag Select Core Stream For Multi Stream Audio Or Image Call is enabled. Use this option to disable all non-core audio and image streams by setting the port to "0" irrespective of codecs allowed by the Route PSP and T.38 configuration. If enabled, the SBC relays all non-core audio and image streams with port set to "0".

  • Disabled (default)
  • Enabled
Terminal Portability Interworking

Controls Terminal Portability Interworking service between ISUP and SIP. When enabled, Terminal Portability Interworking service is enabled. When disabled, Terminal Portability Interworking service is disabled.  The service enables a terminal to be moved from one socket to another or a call to be moved from one terminal to another within one call while the call is active.

  • Disable (default)
  • Enable

SIP Flags

On the Flags window, choose the IP Signaling Profile as DEFAULT_SIP to view the flags for SIP trunk groups.

The Edit Flags window opens showing flags that apply to SIP trunk groups.

Figure 2: Trunk Provisioning - Common IP Attributes SIP Flags 


SIP Trunk Group Flags

Parameter

Description

Accept Alert Info

 Enable this flag to have the SBC process the URI specified in the Alert-info header received in a 180 Ringing message, and to use the tone specified in the Alert-Info header as the Local Ring Back Tone to play.

Note:

When this flag is enabled, the tones processed override any incoming tones in the media stream. For example, when Accept Alert Info is enabled, the SBC plays the tone specified in the Alert-info header of the 180 ringing message overriding the in-band tones included in the 180 Ringing message.

  • Disable (default)
  • Enable
Add Path Service Route

Enable this flag to allow the SBC to add two Path headers in a REGISTER request towards the Core (SBC acting as P-CSCF or IBCF) (Create Service Path Header must be enabled) OR to add two Service-Route headers in the 200 OK response to a REGISTER towards the P-CSCF (SBC acting as IBCF) (Create Service Route Header must be enabled).

Note:

When the No Service Route Hdr For Emergency Registration flag is enabled, the SBC does not add Service-Route headers for emergency registrations even if the Add Path Service Route and Create Service Route Header flags are enabled.

  • Disable (default)
  • Enable
Add PCharging Func Addr

Specifies whether or not to add a P-Charging Function Address header.

  • Disable (default)
  • Enable
Ai To Pem Interworking

Use this flag is configure interworking between Alert-Info and P-Early Media headers.

  • Disable (default) - the SBC plays tones based on the LMSD format.
  • Enable - the SBC plays tones based on the interworking between the Alert-Info and P-Early Media headers.
Call Holding Interworking

Controls the Call Hold Interworking service between ISUP and SIP is enabled or disabled. The service converts an ISUP call hold to an SIP call hold, or vice-versa. Call holds are invoked by ISUP or SIP/ H.323 endpoints. When disabled, call hold indications are dropped.

  • Disable (default)
  • Enable
ClearMode for Data Calls

This parameter is used to enable the clearmode function for data calls. When enabled, the SBC enables clearmode. When disabled, the SBC provides legacy G.711 behavior.

  • Disable (default)
  • Enable
Contact Transparency For Is Focus Media Tag

Enable this flag to transparently pass the Contact header in outgoing messages when the "isFocus" parameter is received in the Contact header.

  • Disable (default)
  • Enable
Create Path Header

 Controls whether or not the SBC creates a Path header in outgoing SIP REGISTER messages.

  • Disable (default)
  • Enable
Create PCharging Vector

Controls whether or not a P-Charging-Vector header is created in outgoing SIP messages. Creating P-Charging-Vector headers is supported in INVITE and REGISTER messages. It is also supported in SUBSCRIBE, OPTIONS, and NOTIFY messages when received from the same direction as the REGISTER message.

  • Disable (default)
  • Enable
Create PVisited Network Id

Specifies whether or not to create the P-Visited-Network-ID header.

  • Disable (default)
  • Enable
Create Service Route Header

 Controls whether or not the SBC creates a Service-Route header in outgoing SIP messages.

Note:

When the No Service Route Hdr For Emergency Registration flag is enabled, SBC does not add Service-Route headers for emergency registrations even if the Add Path Service Route and Create Service Route Header flags are enabled.

  • Disable (default)
  • Enable
Customized Session Timer BehaviorSpecifies the session timer behavior expected by the remote peer. When enabled, the remote peer expects customer-specific session timer behavior. When disabled, the remote peer expects the standard session timer behavior.
  • Disable (default)
  • Enable
Disable Also Header

Specifies whether to use the Also header. When enabled, the SBC ignores the Also header if received from the remote peer and the SBC does not send the Also header to the remote peer. When disabled, the SBC uses the Also header for call forwarding as usual.  

  • Disable (default)
  • Enable
Disable Host Translation

Specifies whether to enable or disable host name translation. This applies to all URL style headers that require transparency and defines the processing that the SBC is to apply to the host name portion of these headers before forwarding.

  • Disable (default)
  • Enable
Disable Media Lock Down

If the SBC offers both pass-thru and transcode codecs, the Minimize Relaying Of Media Changes From Other Call Leg flag effectively suppresses re-INVITEs to peers when the peer answers with a single codec. However, if the peer has multiple codecs, the Minimize Relaying Of Media Changes From Other Call Leg flag in certain situations cannot suppress the e-INVITEs because change in one of the common codecs is detected. In these situations, if the SBC’s most preferred codec matches the peers most preferred codec, the Disable Media Lock Down flag can be used to suppress this Modify Offer. The Disable Media Lock Down flag controls the modified offer initiated by the SBC to lock down the codec. If this flag is disabled, the SBC sends a modified offer to lock down the codec. If enabled, the SBC will not initiate a modified offer to lock down the codec. See examples following the table.

  • Disable (default)
  • Enable
Disable Non Core Audio And Image Streams

This flag is visible only when the flag Select Core Stream For Multi Stream Audio Or Image Call is enabled. Use this option to disable all non-core audio and image streams by setting the port to "0" irrespective of codecs allowed by the Route PSP and T.38 configuration. If enabled, the SBC relays all non-core audio and image streams with port set to "0".

Disable Refer To Uri Parameters

By default, parameters in the SIP URI Refer-To header are passed through to the outgoing INVITE. When this option is enabled, this pass through does not occur. When disabled, the URI parameters are copied to the Refer-To field in the outgoing INVITE.  

  • Disable (default)
  • Enable
Discard Received Reason Header

Specifies whether to use the cause code in the Reason header received from the remote peer. When enabled, the SBC ignores the cause code in the received Reason header. When disabled, the SBC uses the cause code in the received Reason header.

  • Disable (default)
  • Enable
Do not Include Ss Attribute In Re Invite

Specifies whether the SBC sends silence suppression to the remote peer. When enabled, the SBC does not send silence suppression (no a=silenceSupp is sent) in the SDP to the remote peer. When disabled, and when silence suppression is off, the SBC sends a=silenceSupp:off in the SDP to the remote peer. Note that a=silenceSupp:on is never sent to the remote peer in the Ribbon implementation when silence suppression is on.  

  • Disable (default)
  • Enable
Enable Default PUIProcedures

Specifies whether or not to enable the Default PUI Procedure flag.

  • Disable (default)
  • Enable
Enable Dial String Handling

This flag is primarily used to enable/disable transparency of dial string (i.e username) received in request URI of INVITE message. Transparency does not occur, however, if PSX/ERE returns globalized or non-private called address. SBC performs dial string identification based on RFC 4967.

  • Disable (default)
  • Enable
End To End Bye

Controls whether the SBC will issue an end-to-end BYE on the side initiating the disconnect, depending on the receipt of a BYE from the other leg. When enabled, for SIP-SIP calls, the SBC does not issue the 200 BYE on the side initiating the disconnect until the 200 BYE is received from the other leg. When disabled, for SIP-SIP calls, the SBC issues the 200 BYE on the side initiating the disconnect regardless of whether a 200 BYE is received from the other leg.

  • Disable (default)
  • Enable
End To End Re Invite

When this flag is enabled, the SBC forwards re-INVITEs received from one leg (with or without SDP) to the other leg.

  • Disable (default)
  • Enable
End To End Update

When this flag is enabled, the SBC forwards UPDATEs (With SDP) received from one leg to the other leg.

  • Disable (default)
  • Enable
Suppress E2ESession Refresh

When the "End To End Update" and/or "End to End re-INVITE" flags are enabled, the SBC relays an end-to-end session refresh UPDATE/re-INVITE to the other call leg. Enable this flag to override this behavior and allow the SBC to process the session refresh UPDATE/re-INVITE locally instead of relaying the session refresh messages end-to-end.


This flag is only available when the "End To End Update" and/or the "End to End re-INVITE" flags are enabled.


The SBC applies this flag on both the ingress and egress legs even if it is enabled on just one IPSP.

  • Disable (default)
  • Enable

Refer to UPDATE and re-INVITE Suppression for additional feature details.

End To End Prack

When this flag is enabled, the SBC forwards the received reliable provisional response without generating a PRACK locally. It waits for the PRACK from the ingress peer to generate a PRACK towards egress peer.

  • Disable (default)
  • Enable
Note:

This flag must be enabled when both endpoints support PRACK and the 100rel header extension.

From Header Anonymisation

Enable this flag to prevent the From header of INVITE messages from being anonymized. The SBC always relays the From header of INVITEs. 

  • Disable (default)
  • Enable
Include Ip Ports in From And To Headers

When enabled, port numbers are included with IP addresses in the From and To headers of SIP messages. When disabled, port numbers are not included with IP addresses.

  • Disable (default)
  • Enable
Include Reason Header

When enabled, the SBC includes the Reason header in 18x, 4xx, 5xx, Cancel, and Bye messages in the forward direction. It is provisioned on the egress trunk group.  

  • Disable (default)
  • Enable
Include Ss Attribute In Initial Invite

Specifies whether the SBC sends the SS attribute in the initial Invite to the remote peer. When enabled, the a=silenceSupp:off is sent in the Initial Invite SDP to the remote peer when Silence Suppression is OFF. When disabled, a=silenceSupp is not sent in the Initial Invite SDP to the remote peer. Note that a=silenceSupp on is never sent to the remote peer in the Ribbon implementation when Silence Suppression is ON.

  • Disable (default)
  • Enable
Include Transport Type In Contact Header

This flag is used by an SBC configured for an external PSX.

When this flag is enabled, the SBC includes the transport type parameter in the Contact headers of 3XX responses. The PSX sends the value of this flag in a DIAMETER response to the SBC. When this flag is disabled, the SBC does not include the transport type parameter.

  • Disable (default)
  • Enable

NOTE: Ensure the Pass Complete Contact Header flag is disabled (except for the REGISTER method) to obtain the desired behavior.

Insert PAccess Network Info

 Enable this flag to have the SBC construct and send a P-Access-Network-Info header using received location info.

  • Disable (default)
  • Enable
Insert Peer Address As Top Route Header

When enabled, the SBC SIPE inserts the IP address of the next hop in the top Route header of the egress INVITE. This is required when the SBC is acting as an IMS BGCF proxy. It is also used to support SIPConnect compliance for direct inward dialing.

  • Disable (default)
  • Enable
Insert UEFlow Info

 Enable this flag to send a P-UE-Flow-Info header towards the core.

  • Disable (default)
  • Enable
Lock Down Preferred Codec

Enable this flag to maintain using the most preferred codec of the leg on which it is enabled even if it requires transcoding. This feature also suppresses triggering a re-INVITE on the leg (on which it is enabled from the SBC) due to a Modify Offer received from the other leg as part of mid-call codec modification.

  • Disable (default)
  • Enable
Note:

This flag must be enabled in conjunction with Minimize Relaying Of Media Changes From Other Call Leg All flag.

Note:

When this flag is enabled, the flag Relay Data Path Mode Change From Other Call Leg must also be enabled to propagate HOLD Modify Offers (any modify offer that changes the data-path-mode).

Map Cause Location

Specifies whether or not to enable the Map Cause Location flag.

  • Disable (default)
  • Enable
Map Suspend Resume Event In PSvc Info Header

Controls whether or not the SBC maps the suspend/resume event in the P-Svc-Info header of SIP messages.

  • Disable (default)
  • Enable
Map Uui In PSig Info Header

Specifies whether or not the SBC maps the UUI parameter and includes it in the SIP P-Sig-Info header.

  • Disable (default)
  • Enable
Map Dpm To Sendrecv For Initial Dialog

When this parameter is enabled, direction attribute a=sendrecv is sent in the outgoing initial invite when a=inactive is received in the Invite from other side, or a=sendrecv is sent in responses to initial invite when the response from other side is received with a=inactive.

  • Disable (default)
  • Enable
Mime Cause Precede Reason Header Cause

When enabled, the cause value is mapped from the MIME body of the incoming message based on the Q.1912 standard. When disabled, the cause value is mapped from the Reason header based on the RFC3398 standard.

  • Disable (default)
  • Enable
Minimize Relaying Of Media Changes From Other Call Leg All

The advertised SIP SDP is described as a set of capabilities that the SBC can receive. The SBC by default issues a Modify Offer (re-INVITE, UPDATE) whenever it detects a change in receive capabilities. In certain scenarios, the Modify Offer can be perceived as redundant. Enabling Minimize Relaying Of Media Changes From Other Call Leg All flag suppresses redundant Modify Offers being sent from the SBC.

When enabled, the SBC suppresses modify offers that have no changes to the “common codecs” that impact the end-user experience. “Common codecs” are codecs that exist both in the initial offer and answer. Changes to common codecs imply changes to DTMF, packetization time, codec specific FMTP attributes and data-path-mode. See examples following the table.

  • Disable (default)
  • Enable
No Content Disposition

Specifies whether including a Content Disposition header in SIP messages is expected by the remote peer. When enabled, the remote peer expects no Content Disposition header. When disabled, the remote peer expects the standard SIP message format, which includes the Content Disposition header.

  • Disable (default)
  • Enable
No Port Number5060

This parameter is used by the SBC to control whether port number 5060 is sent to the remote peer in the Request-URI of PRACK, ACK, and BYE messages.  When enabled, the outgoing SIP URI does not include the port number 5060 (sip:user@host). In addition, the SBC only sends out port numbers in the Record-Route and Route headers of SIP request and response messages if it receives a port number in Record-Route headers.  When disabled, the outgoing SIP URI includes the port number 5060 (sip:user@host:5060). In addition, if the SBC does not receive a port number in the Record-Route headers of SIP request and response messages, the SBC inserts the port number 5060 in outgoing Record-Route and Route headers.

  • Disable (default)
  • Enable
No Service Route Hdr For Emergency Registration

Enable this flag to stop the SBC from adding Service-Route headers for emergency registrations even if the Add Path Service Route and Create Service Route Header flags are enabled.

  • Disable (default)
  • Enable
No Userinfo In Contact Header

Specifies whether including userinfo in Contact headers in SIP messages is expected by the remote peer. When enabled, the remote peer expects no userinfo component in the Contact header URI. When disabled, the remote peer expects the standard format of the Contact header, which includes the userinfo component.

  • Disable (default)
  • Enable
Only Selected Codec In Session Refresh
When this flag is enabled, the SDP in a session keep-alive re-INVITE message will only include the currently-selected codec for the call. When disabled, the SDP in a session keep-alive re-INVITE message will be identical to that in the last offer. See example below.
  • Disable (default)
  • Enable

Example:

--> The SBC sends an INVITE including Codec-A and Codec-B

<-- An 18x message is received identifying Codec-B.

--> The SBC sends a keep-alive re-INVITE depending upon the flag setting:

  • Disable: SBC sends keep-alive re-INVITE with both Codec-A and Codec-B included

  • Enable: SBC sends keep-alive re-INVITE including Codec-B

Note:

The o-line of the SDP will be identical to that in the last offer.

P Called Party IDSupport

Specifies whether or not to enable P-Called-Party-ID header support. 

  • Disable (default)
  • Enable
P Chg Msg InfoWhen enabled, the SBC adds a P-ChgMsg header to a SIP INFO or a 183 Session Progress message (which it selects depends on the call state). The P-ChgMsg header contains the interworked ISUP CHG with TLEC information. When disabled, this function is disabled.  
  • Disable (default)
  • Enable
Publish IPIn Hold SDP

 Enable this flag to include the SBC's IP address in the SDP on-hold. 

  • Disable (default)
  • Enable
Reject Refer

When enabled, the SBC rejects SIP REFER messages from the peer and responds with a 405 Method Not Allowed message.

  • Disable (default)
  • Enable
Replace Host On Via Header

When enabled, the SBC will replace the IP address of the top-most Via header in the initial outbound INVITE or REGISTER request with the IP address or hostname it received in the top-most Via header of the incoming request. When disabled, the SBC defaults to B2BUA behavior where the VIA header contains the local SIP signaling address.  

  • Disable (default)
  • Enable
Re Query Psx On Register Refresh

When enabled, the SBC will re-query the PSX when it receives a REGISTER refresh message, which may result in a new or updated result for the REGISTER relay. When disabled, the SBC does not re-query the PSX on a REGISTER refresh.  This setting must be made on the ingress trunk group profile facing the registered endpoint.

  • Disable (default)
  • Enable
Restrict History Info Header

Specifies whether to restrict the HistoryInfo header, depending on the Privacy header or Privacy URI header parameter values.  

  • Disable (default)
  • Enable
Route Using Recvd Fqdn

Enable this flag to use the FQDN received in the Contact header of a Refer-To or 3xx message for routing.

  • Disable (default)
  • Enable
SDP Oline Only Compares

When enabled, the SBC checks only the o-line when comparing SDPs. When disabled, the SBC checks the entire SDP body when comparing SDPs.

  • Disable (default)
  • Enable
Send RTCPBandwidth Info

Enable this flag to send the RR and RS bandwidth information, as well as "b=RR:" and "b=RS:" in the SDP offer.

  • Disable (default)
  • Enable
Send All Allowed Codecs For Late Media Invite Or Re Invite

When enabled, the SBC sends all allowed codecs in the SDP offer in response to a late media INVITE or re-INVITE. When disabled, the SBC sends the codec selected in the Offer SDP in response to a late media INVITE or re-INVITE.

  • Disable (default)
  • Enable
Send Direct Media Info In SDP Attribute
 Used by the SBC to enable encoding direct media information in signaling. When enabled, the SBC sends direct media information in the SDP attribute X-dmi. When disabled, the SBC does not send direct media information.
  • Disable (default)
  • Enable
Note

The 'directMediaAllowed' flag must be disabled on the associated trunk group.

Caution

You must enable the "Send Direct Media Info In Sdp Attribute" flag for

  • any IPSP where you expect to include the X-DMI attribute in SDP, regardless if direct media is enabled or disabled, and for
  • any trunk that might receive an INVITE from direct-media-enabled trunks.

Send Ptime In SDP

This parameter takes effect only when the trunk group parameter, Direct Media Allowed, is disabled. When enabled, the SBC sends an a=ptime attribute in the SDP. When disabled, the SBC does not send a=ptime in the SDP.

  • Disable (default)
  • Enable

Note: If the flag is enabled in the ingress IP signaling profile only, the SBC only sends the ptime attribute in the SDP in the ingress signaling. However, if the flag is enabled in the egress IP signaling profile, the SBC sends the ptime attribute in the SDP in both the ingress and egress signaling.

Send Rtcp Port In Sdp

When this flag is enabled, the SBC adds the attribute,a=rtcp:<RTCPPort> to the audio and video m-lines in the outgoing SDP (RTCP port mentioned will be SBC RTP port + 1). When disabled, the SBC does not add the attribute a=rtcp:<RTCPPort> to the audio and video m-line in the outgoing SDP.

  • Disable (default)
  • Enable
Session Timer Refresh Update

This flag controls the session timer refresh method used with SIP peers. When enabled, the SBC sends UPDATE messages. When disabled, the SBC resends INVITE messages.

  • Disable (default)
  • Enable
Set Accept Header To Application Sdp Only

Specifies whether including a short Accept header in SIP messages is expected by the remote peer. When enabled, the remote peer expects a short Accept header format that contains the application/ SDP value only. When disabled, the remote peer expects the standard Accept header format containing all of the standard parameters.

  • Disable (default)
  • Enable
Set Oline Dash

Specifies what SDP o-line format is expected by the remote peer. When enabled, the remote peer expects an o-line format in which the username component is set to a "-" (dash). When disabled, the remote peer expects the standard o-line format containing all of the o-line parameters, including the username.  

  • Disable (default)
  • Enable
Set Session Version Zero

Controls the session version used in outbound SDP. When enabled, the SBC sets the session version to zero in the o-line of the outbound SDP. When disabled, the SBC assigns a session version randomly.

  • Disable (default)
  • Enable
Set Sline Dash

Specifies what SDP s-line format is expected by the remote peer. When enabled, the remote peer expects a short s-line format that contains a dash only (s=-). When disabled, the remote peer expects the standard s-line format containing all of the s-line parameters.

  • Disable (default)
  • Enable
Skip Psx Query For Refer

Specifies whether to skip the PSX query for REFER requests.

  • Disable (default)
  • Enable
Store Path Header

Controls whether a Path header received in an incoming SIP message is stored/cached locally on the SBC. When enabled, the received Path header is stored. When disabled, the received Path header is not stored.  

  • Disable (default)
  • Enable
Store Service Route Header

Controls whether a Service-Route header received in a 200-class response to a REGISTER request is stored/ cached locally on the SBC. When enabled, the received Service-Route header is stored. When disabled, the received Service-Route header is not stored.  

  • Disable (default)
  • Enable
Store PCharging Func Addr

Specifies whether or not to store the P-Charging-Function-Addresses header.

  • Disable (default)
  • Enable
Store PCharging Vector

When this flag is enabled, the SBC stores the P-Charging-Vector (PCV) header it received in requests. When the response is forwarded back, the stored PCV is inserted and sent. If the SBC receives the PCV when this flag is disabled, the SBC ignores the PCV and does not log it in the CDR.

  • Disable (default)
  • Enable

Example of SBC acting as IBCF:
           INVITE (PCV1) --> SBC --> INVITE
           200 OK (PCV1) <-- SBC <-- 200 OK


Send Only Preferred Codec

Use this flag to have the SBC send a single preferred codec in an answer to an initial offer or re-INVITE.

  • Disable – When disabled, the SBC sends all possible pass-through codecs in the route's Packet Service Profile when the call is answered.
  • Enable (default) – Enable the flag on the Answer side to send single preferred codec in the answer to an initial offer or Re-INVITE. Enable the flag on the Offer side to send the most preferred codec in a Re-INVITE offer.
Send SBCSupported Codecs For Late Media Re Invite

Enable this flag to have the SBC include all pass-through and transcodable codecs supported on that leg in the SDP offer sent in the 200 OK response to a late media re-INVITE request.

  • Disable (default)
  • Enable
Note:

This flag takes precedence over the Send All Allowed Codecs For Late Media Invite Or re-INVITE flag and the Send Only Preferred Codec flag. The SIP trunk group media flag Late Media Support must be set to Convert for the behavior enabled by the Send SBCSupported Codecs For Late Media re-INVITE flag to apply.

Select Core Stream For Multi Stream Audio Or Image Call

When enabled, the SBC selects the core stream based on the Route PSP from multiple audio or image streams received in the incoming offer. The dependent flag Disable Non Core Audio And Image Streams is visible for configuration only when this flag is enabled.

  • Disabled (default)
  • Enabled
Suppress Min Se If Not Received

 When this flag is enabled, the Min-SE header is added to re-INVITEs/UPDATEs only if it exists in the previous offer/answer. When this flag is disabled, Min-SE is always added to session refreshes.

  • Disable (default)
  • Enable
Suppress Refer Relay From Other Leg 

This flag is significant only when the REFER_RELAY flag is enabled in the peer IPSP. 
When this flag is enabled, relaying of REFER is stopped and the REFER is locally processed. Hence, SBC transfers the call.

  • Disable (default)
  • Enable
Support Call Info With SIP Cause 608 RFC 8688

Enable this flag to process the Call-Info in a 608 SIP response code from the PSX, and then set the value in to the outgoing SIP response message (in support of RFC 8688).

  • Disable (default)
  • Enable
Support SCSCFRestoration Procedures

When enabled, the SBC, acting as P-CSCF, rejects a request with a 504 (Server Time-out) response that carries a MIME body of type application/3gpp-ims+xml, if the SBC does not receive any response to a request from the S-CSCF network or the next hop address is blacklisted as part of ARS (Address Reachability Service) service (see IMS Restoration Procedures for additional details).

  • Disable (default)
  • Enable
Terminal Portability Interworking

Controls whether Terminal Portability Interworking service between ISUP and SIP is enabled. The service enables a terminal to be moved from one socket to another or a call to be moved from one terminal to another within one call while the call is active.

  • Disable (default)
  • Enable
Use PSX Routefor Registered Invite

Enable this flag to route INVITEs from the core to the received PSX route for registered users, but not to the Contact address of the RCB.

  • Disable (default)
  • Enable
Validate Access Nw Info Header

Specifies whether to forward the P-Access-Network-Info header when the network-provided parameter is present.

  • Disable (default)
  • Enable

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

Note

The SBC gives precedence to SIP Privacy handling when the SIP Adaptive Transparency Profile is enabled. For example, if the incoming SIP message has "privacy: Id" and the flag Apply Privacy Id under Profiles > Services > Privacy Profile is set to Enabled, the SBC does not include P-ASSERTED-ID header in the egress message.

For more information on Privacy Profile, refer to the following pages:

 Several flags prevent the SBC from relaying a re-INVITE, or an UPDATE, to the other leg of the call. When you enable such flags, the behavior is contradictory to that of the SIP Adaptive Transparency Profile. 

To resolve such conflicts, the SBC gives precedence to the SIP Adaptive Transparency Profile over the following flags:

  • Parent Object: Profiles > Signaling > IP Signaling Profile > Common IP Attributes > Flags
    • Relay Data Path Mode Change From Other Call Leg
    • Minimize Relaying Of Media Changes From Other Call Leg All
    • Disable Media Lock Down
    • Lock Down Preferred Codec
    • Call Hold Interworking 
  • Parent Object: Address Context > Zone > SIP Trunk Group > Signaling
    • Sdp 100rel Iwk For Prack 
    • Rel100 Support
  • Parent Object: Address Context > Zone > SIP Trunk Group > Media
    • Late Media Support

 

For more information on the flags mentioned above, refer to the following pages:

For more information, refer to Services - SIP Adaptive Transparency Profile.


Call Flow Examples

Call Flow Examples for 'Disable Media Lockdown' Flag

Example1:

In the following call flow, the Modify Offers (in green) are suppressed if the Minimize Relaying Of Media Changes From Other Call Leg flag is enabled:

Ingress Peer

 

SBC

 

Egress Peer

G711U

->

SBC offers G711U as pass-through codec and G729A as a transcode option by reserving a DSP channel

->

G711U,G729A

G711U

<-

SBC releases the DSP channel resulting in a G711U pass-thru call

<-

G711U



Receive capabilities of SBC have changed as a codec G729A was removed and the DSP channel de-allocated.
Default behavior is to send Modify Offer; to suppress, the Minimize Relaying Of Media Changes From Other Call Leg flag should be enabled

->

G711U




<-

G711U

Example 2:

The messages (in green) can be suppressed if the Disable Media Lock Down field is enabled.

Ingress Peer

 

SBC

 

Egress Peer

G711U

->

SBC offers G711U as pass-through codec and G729A as a transcode option by reserving a DSP channel

->

G711U,G729A

G711U

<-

SBC releases the DSP channel resulting in a G711U pass-thru call

<-

G711U,G729A



Receive capabilities of SBC have changed as a codec G729A was removed and the DSP channel de-allocated.
Default behavior is to send Modify Offer; the Minimize Relaying Of Media Changes From Other Call Leg flag cannot suppress this Modify Offer as a common codec in the original offer and answer (G729A) has been removed; To suppress this re-INVITE, enable DML

->

G711U




<-

G711U

Ingress Peer

 

SBC

 

Egress Peer

G711U

->

SBC offers G711U as pass-through codec and G729A,G726 as transcode options by reserving a DSP channel

->

G711U,G729A,G726

G711U

<-

Transcode G711-G729A call. Egress codec is locked down to G729A

<-

G729A,G726



Receive capabilities of SBC have changed to G729A due to transcode.
Default behavior is to send Modify Offer to lockdown to G729A; the Minimize Relaying Of Media Changes From Other Call Leg flag cannot suppress this Modify Offer as a common codec in the original offer and answer (G726) has been removed; To suppress this re-INVITE, enable DML

->

G729A




<-

G729A

Example 3:

Scenario in which Disable Media Lockdown field can not suppress the media lock down messages (in green).

The codecs configured at Egress route PSP are G711U, G726, G729A with HRP disabled.

Ingress Peer

 

SBC

 

Egress Peer

G711U

->

SBC offers G711U as pass-through codec and G726,G729A as transcode options by reserving a DSP channel

->

G711U,G726,G729A

G711U

<-

Transcode G711-G726 call. Egress codec is locked down to G726

<-

G729A,G726



Receive capabilities of SBC have changed to G726 ( i.e. HRP is disabled). Since, the codec selected by SBC is different from Peer’s preferred codec (G729), though the flag DML is enabled SBC sends a Modify Offer to lockdown to G726.

->

G726




<-

G726

Call Flow Examples for 'Minimize relaying of Media Changes From Other Call Leg All' Flag

Example1:

The re-INVITEs (in green) are suppressed if the Minimize Relaying Of Media Changes From Other Call Leg flag is enabled.

Ingress Peer

 

SBC

 

Egress Peer

G711U

->

SBC offers G711U as pass-through codec and G729A as a transcode option by reserving a DSP channel

->

G711U,G729A

G711U

<-

SBC releases the DSP channel resulting in a G711U pass-thru call

<-

G711U



Receive capabilities of SBC have changed as a codec G729A was removed; send Modify Offer to Peer to advertise the latest set of capabilities

->

G711U




<-

G711U

Example2:

SBC suppresses a Modify Offer from the ingress peer. The offer changes the maxptime from 10 to 20ms. An increase in maxptime can be suppressed – a device that advertises a maxptime of 20ms can also receive 10ms packets.

Ingress Peer

 

SBC

 

Egress Peer

G711U 10ms

->


->

G711U 10ms

G711U

<-


<-

G711U

re-INVITE (G711U 20ms)

->

Suppress the re-INVITE if minimize media is enabled and respond to ingress peer; else forward the re-INVITE to egress

->

G711U 20ms

G711U

<-


<-

G711U

Conversely, irrespective of the state of the Minimize Relaying Of Media Changes From Other Call Leg flag All field cannot suppress a change of maxptime from 20ms to 10ms.

Ingress Peer

 

SBC

 

Egress Peer

G711U 20ms

->


->

G711U 20ms

G711U

<-


<-

G711U

re-INVITE (G711U 10ms)

->


->

G711U,10ms

G711U

<-


<-

G711U

Example3:

A change of data-path-mode from sendrecv to sendonly ( HOLD request) can also be suppressable. The rational is that SBC can always ignore the media received from the peer and continue to send it media.

Ingress Peer

 

SBC

 

Egress Peer

G711U sendrecv

->


<-

G711U sendrecv

G711U

<-


->

G711U

re-INVITE (G711U sendonly)

->

Suppress the re-INVITE if minimize media is enabled and respond to ingress peer; else forward the re-INVITE to egress

<-

G711U sendonly

G711U

<-


->

G711U

Conversely, SBC irrespective of the state of the Minimize Relaying Of Media Changes From Other Call Leg flag, cannot suppress a change of data-path-mode from sendonly to sendrecv.

Ingress Peer

 

SBC

 

Egress Peer

G711U sendonly

->


->

G711U sendonly

G711U

<-


<-

G711U

re-INVITE (G711U sendrecv)

->


->

G711U sendrecv

G711U

<-


<-

G711U

Call Flow Examples for 'Relay Data Path Mode Change From Other Call Leg' Flag

Example1:

When Minimize Relaying Of Media Changes From Other Call Leg flag is enabled, and when Relay Data Path Mode Change From Other Call Leg is disabled:

Ingress Peer

 

SBC

 

Egress Peer

G711U,G729A sendrecv

->


->

G711U,G729A sendrecv

G711U

<-


<-

G711U

re-INVITE (G711U sendonly)

->

Suppress the re-INVITE and respond to ingress peer. Discard media received from the egress peer



G711U

<-




Example2:

When the Minimize Relaying Of Media Changes From Other Call Leg flag is enabled, and when Relay Data Path Mode Change From Other Call Leg is enabled:

Ingress Peer

 

SBC

 

Egress Peer

G711U,G729A sendrecv

->


->

G711U,G729A sendrecv

G711U

<-


<-

G711U

re-INVITE (G711U sendonly)

->


->

G711U sendonly

G711U

<-


<-

G711U