Phones Ring but NO VOICE - complete silence

Unanswered Question
Jun 28th, 2009

My current setup is as follows

PBX to VOIP routers - WAN - VOIP router to PBX

Calls are getting connected and the phone rings at either site, when someone picks the phone up there is just silence.

any suggestions?

Thanks in advance for any help

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pgcristovam Sun, 06/28/2009 - 16:24


Yes, look the routing rules (acl, firewall...) all that can to block the rtp.

The RTP and signaling protocol, use differente ports.



freenesss Mon, 06/29/2009 - 00:48

There is full routing between the 2 routers accross the WAN, there are also no firewalls in place or ACL's on any router interfaces.

is there anything else i should be looking at, or any other possible causes to this problem?

pgcristovam Mon, 06/29/2009 - 05:48

Try to create a voice class codec


(config)#voice class codec 1

(config-xx)#codec preference 1 g729r8

(config-xx)#codec preference 2 g729br8

On both routers and apply this voice class on dial-peer voip


dial-peer voice x voip

voice-class codec 1

So, on dial-peer voip put the command:

incoming call .T


dial-peer voice x voip

incoming call .T




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