Sip trunk between to CCM 4.13 server

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Oct 13th, 2008
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I have two locations and I am testing the following

- Sip trunk between them

Both locations have a CCM of 4.1.3

Both locations are connected via a VPN tunnel

--- The Tunnel is set to allow traffic from both voice networks. it is setup to allow tcp/up (all ports)

I created the sip trunk in ccm on both servers. I created the CCS and route pattern to test between both sides.

I can call each side, it answers. But I cannot hear any voice

I can hear DTMF tones when pressed but no audio.

I also see some werid issues with call hold and stuff but i am assuming thats the Limited SIP compat in the verison of call manager

Remote site - PIX 515

Main site - ASA 5520

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Jaime Valencia Mon, 10/13/2008 - 13:23
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seems SCCP traffic is routing correctly but not RTP, i'd suggest you to check any ACL config you have in there and also to verify the routing between the endpoints, sounds like a routing or blocking issue



if this helps, please rate

D0nprintup_2 Tue, 10/14/2008 - 04:05
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its conencted via a tunnel. all traffic from can reach and back.

The weird thing, I uninstalled my ip communicator and reinstalled it and now it works.

I dont believe there was an ACL since its a tunnel and I am protecting the entire subnet on both sides

bilmartin Tue, 10/14/2008 - 01:24
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could be, but try restarting CM service on both sides to test.

ajaynstyagi Wed, 10/15/2008 - 02:16
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I was also facing same problem in my network.

Calling signal was passing properly but RTP packets are blocked. after open the UDP port no 16834 to 32767 on firewall it's working fine.

You can test on IP Phone (79XX) whether RTP Packet blocked or not. Make a call between clusters and press the ? Button twice on IP Phone.

And check RX and TX statics.


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