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voice source-group CCA_SIP_SOURCE_GROUP_CUE_CME

Trying to understand what the chunk of config below. It seems to prefix the called number of calls from on-net users with 'ABCD', then strip if off, send to the CUE .....

voice source-group CCA_SIP_SOURCE_GROUP_CUE_CME
access-list 2
translation-profile incoming SIP_Incoming

voice translation-profile SIP_Incoming
translate called 411

voice translation-rule 411
rule 1 /^9\(.*\)/ /ABCD9\1/

access-list 2 permit
access-list 2 permit
access-list 2 permit
access-list 2 permit

dial-peer voice 1003 voip
description ** Passthrough Inbound Calls for PSTN from CUE **
translation-profile incoming SIP_Passthrough
session protocol sipv2
session target ipv4:
incoming called-number ABCDT
dtmf-relay rtp-nte
codec g711ulaw
no vad

voice translation-profile SIP_Passthrough
translate called 412

voice translation-rule 412
rule 1 /^ABCD\(.*\)/ /\1/


voice source-group CCA_SIP_SOURCE_GROUP_CUE_CME

Hello. This is a bit of a hack.

There's an incoming dial-peer on the router which matches all incoming calls (unless a specific DID has been configured) and rejects the call. The dial-peer has "permission term" configured. This is part of the toll fraud / anti loop mechanism which configured the router to only accept incoming calls placed to numbers which are configured on the system.

Remembering that the Unity module is a separate SIP UA, calls from CUE destined to PSTN would fail because of this, so what they've done is prefix incoming calls from networks described by access-list 2 (i.e. the CUE module) with ABCD. We then have an incoming dial-peer which matches calls starting ABCD, this is removed and the call is sucsessful.

Hope this helps


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