Acme Packet (MOSC)

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Call forward on CUCM behind SBC - no audio issue

edited Jun 12, 2025 10:15AM in Acme Packet (MOSC) 7 commentsAnswered ✓

hello,

we have a problem with call forward on Cisco Call Manager, this is the scenario of the call

PSTN→Firewall with NAT→local SBC→coreSBC→CUCM→(callForward)→coreSBC→localSBC→PSTN

call from PSTN is diverted to another PSTN number

. When a call is diverted there is no audio. A solution that Cisco offers in these cases is to use a media server on a trunk with SBC, and this solution is a valid one but we don't want to use media server for all calls over that trunk. Their explanation is that with media server a firewall receives RTP form media server (from inside) nevertheless that audio is originated always on PSTN. We have :

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