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New Member

FXO calls drop after 10min

Hi,

the scenario is

IP Phone - CM4.2 - H323 - VG - FXO - PSTN. after 10min outgoing calls generate echo and then the call drop. it happens arbitrarily.did anyone face this issue.

Regards,

6 REPLIES
Cisco Employee

Re: FXO calls drop after 10min

the most common reason why calls fail after the magical 10 minutes is there is a TCP keepalive timeout, and this then kills the H323 session. Chances are you have some kind of firewall of something else that is blocking the traffic.

We had several incidents of this being caused by customers putting 'Trend Micro Personal firewall' on the CUCM servers.

Another way to confirm this is a timeout issue is to change from H323 to SIP. These calls use UDP based transport, so there is no need for a layer 4 keepalive.

Re: FXO calls drop after 10min

try changing gateway ios

once i was having this regorous issue with mgcp and it was a bug of mgcp protocol....

u can try that also....

New Member

Re: FXO calls drop after 10min

I tried earlier, but this didn't solve the problem.

New Member

Re: FXO calls drop after 10min

but I am using Call Manager version 4.2 so I can't use SIP neither MGCP because it doesn't support Caller-ID feature, I have Cisco ASA between the Voice router and the LAN: IPPhone - CCM - ASA - VG.

the problem is that this doesn't happen constantly. appreciate if you have some hints.

Hall of Fame Super Gold

Re: FXO calls drop after 10min

Do you have anything between router and CM ?

Hall of Fame Super Gold

Re: FXO calls drop after 10min

You should remove the ASA from the path, as indicated to you above.

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