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Overview

When the SBC has multiple peers (trunks) on an external/public side and a single large trunk to the C15 on an internal/private side, the C15 uses the tgrp parameter to partition out this large trunk group and to be able to track the destination of outgoing calls on the public side of the SBC, as well as tracking the public trunk from which incoming calls were received.

This requires trunkgroup naming continuity between SBC and C15 configurations.

Figure 1: Configuring the SBC for the C15

 


For Outgoing Calls from C15 to a Public Peer

Set the SBC Route on the received tgrp in the Request URI

Provision the Feature Control Profile associated with the trunkgroup facing the C15 so that processDestinationTgrp is enabled and processDestinationTrunkContext is disabled. For details, refer to Feature Control Profile - CLI.

Additionally, the trunkgroup referenced in tgrp= parameter of the INVITE message should have an IP Signaling Peer Group assigned which is the IP address and port to which the SBC will route the outgoing INVITE.

Table 1: FeatureControlProfile Settings

ObjectSet to...Description
processDestinationTgrp enabledEnables processing destination trunk group parameters associated with the specified Feature Control Profile.
processDestinationTrunkContext disabledDisables processing of destination trunk context associated with the specified Feature Control Profile


Command Example

set profiles featureControlProfile DEFAULT_IP
processDestinationTgrp         enable;
processDestinationTrunkContext disable;
processEnumdi                  disable;
ipProtocolFlags {
    useIpProtocol     enable;
    defaultCalledUser enable;
    honorPhoneContextParameter enable;
commit


For Incoming Calls From a Public Peer to the C15

Enable the SBC to send tgrp=”ORIGINATING_TRUNK” in R-URI to the C15 

The SBC will not natively place tgrp=”ORIGINATING_TRUNK” in the outgoing R-URI to C15, it will however place tgrp=”ORIGINATING_TRUNK”  in the Contact header of the outgoing INVITE message.  The IP Signaling Profile on the trunkgroup facing C15 should have egressIpAttributes sipHeadersAndParameters originatingTrunkGroupOptions includeTgrpWithIpAddress set for this.  Additionally the trunkgroup facing the C15 should have the below SMM rule defined as an egress rule to copy the parameter from Contact header to R-URI.

set profiles signaling sipAdaptorProfile AddTgrpToRURI state enabled advancedSMM disabled profileType messageManipulation
#Check for tgrp in the Contact header (should be there from originatingTrunkGroupOptions includeTgrpWithIpAddress setting on IPSP)
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 criterion 1 type message
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 criterion 1 message messageTypes all
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 criterion 2 type header
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 criterion 2 header name Contact condition exist hdrInstance all
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 criterion 3 type parameter
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 criterion 3 parameter condition exist paramType userinfo name tgrp

#Store tgrp to var1

set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 applyMatchHeader one
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 action 1 type parameter operation store paramType userinfo
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 action 1 to type variable variableValue var1 variableScopeValue local
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 1 action 1 from type parameter value tgrp

#Check for R-URI (a formality really so we can apply the action)
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 criterion 1 type message
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 criterion 1 message messageTypes all
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 criterion 2 type header
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 criterion 2 header name request-line condition exist hdrInstance all
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 criterion 3 variable condition not-equal-to variableID var1 value ""
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 criterion 3 type variable


#Add var1 (tgrp=xyz) to the R-URI

set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 applyMatchHeader one
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 action 1 type parameter operation add paramType userinfo
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 action 1 to type parameter value tgrp
set profiles signaling sipAdaptorProfile AddTgrpToRURI rule 2 action 1 from type variable variableValue var1

C15, Sonus SWe Layer 3 routing requirement

A Layer 3 routing element must be present between the C15 and Sonus SWe SBC.  This requirement ensures a quick failover when the Sonus SWe switches activity between units.  If the C15 and Sonus SWe are on the same layer 2 network, the C15 will have a delayed recovery of bearer/media streams when the Sonus SWe switches activity.  Typically, a routed network is set up in a redundant fashion employing VRRP or HSRP (Cisco) protocols on the local subnet for default gateway redundancy.


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