IP Communicator: no audio on second call

Unanswered Question
Jan 25th, 2009

I have tested IP Communicator versions 2.1(1), 2.1(4) and 7.0(1). CUCMBE version is 6.1.2.1000-13.

First call is placed OK. After closing the call, if I place a second call inmediately no audio in both direction results. If I made it successively I get same behavior. But if I wait 2 to 3 minutes after closing a call, next call works fine again.

Problem happens when calling to another IP Communicator or physical phone on the LAN. When calling to PSTN through a 3845 with E1 interface all calls work fine.

I have this problem too.
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gogasca Sun, 01/25/2009 - 16:24

Only 1 PC?

Any Firewall?

If you test to same IP Phone to which first call is originated same issue?

Check sniffer capture to see if we are sending/reciving UDP/RTP packets

oinojosa12 Sun, 01/25/2009 - 16:49

It is happening in all PCs.

There is a PIX-525. PCs are in INSIDE. CUCMBE, physical phones and Cisco 3845 are in DMZ.

Calling to same phone as first call or another get same issue. Also calling between a pair of IP Communicators same issue (both in INSIDE interface).

Sniffer capture shows UDP/RTP packets.

Firts call example packet:

461 13.550210 172.16.5.28 192.168.1.23 RTP PT=ITU-T G.711 PCMU, SSRC=0x41BB26E9, Seq=23365, Time=2467737983

Second call example packet:

4476 44.076129 172.16.5.28 192.168.1.23 RTP PT=ITU-T G.711 PCMU, SSRC=0x153C7E87, Seq=4830, Time=2467982151

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