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538 posts

Ultimate Geek
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Topic # 30461 9-Feb-2009 16:45
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For some reason calls to and from my trixbox over my VFX trunk have started dropping audio after one minute and then the call after a further minute. The only changes I've made recently are adding a 7960 extension and no changes on the router side.

I run a cisco 831 with 5060 forwarded to my trixbox and a couple of entries in the access list that allow 5060 and 16384-53999 from WXC.

Does anyone have any ideas what might cause this?


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221 posts

Master Geek
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  Reply # 194970 9-Feb-2009 19:36
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I've seen a similar problem on a Cisco 831 - the solution was to turn off Cisco Express Forwarding, ie use the config command "no ip cef" and see if there is any improvement...



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  Reply # 194996 9-Feb-2009 22:08
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portunus: I've seen a similar problem on a Cisco 831 - the solution was to turn off Cisco Express Forwarding, ie use the config command "no ip cef" and see if there is any improvement...


portunas, thank-you. have switched it off and so far first test call is 7 minutes and counting. i was starting to pull whats left of my hair out!

thank-you again, x 1,000,000!



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Ultimate Geek
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  Reply # 195051 10-Feb-2009 08:18
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uh-oh.....looks like I spoke too soon. Just had audio drop on another call after 1min.

In my testing earlier I couldnt be bothered speaking to myself/singing etc for the full minute to test, so I put the call on hold and listened to the hold music which played for at least 7 minutes. I've just tried it again and it would appear that for some reason the MoH keeps the audio alive.

Is there some kind of background noise switch that need to be turned on to keep the audio working?

221 posts

Master Geek
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  Reply # 195096 10-Feb-2009 12:59
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sorry to hear it didn't work, the only other thing I can think of is temporarily disabling your firewall/access lists ie remove the ip access group in/out statements from both the inside and outside interfaces and see if that makes a difference...

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