[cisco-voip] Calls over trunk drop after 5:18 min

[Wes Sisk]

This is where i'd place my chips.  default session timeout on an ASA is 
5 minutes:
http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/conns_connlimits.html#wp1080774

find out what signaling is traversing the firewall.  If it is 
h.323/h225/h245 then you can enable TCP keepalives that would avoid a 
timeout:
CSCsq17141    CUCM - Allow TCP KeepAlives for H.323 should enable H.245 
TCP KAs also

There are other situations where users may sit on a conf call on mute 
(not streaming packets) and this causes a voice gateway to detect RTP 
timeout and drop the call.


There are a few opportunities here.  Highest probability is firewall.  
Next is gateway.  Next is get a packet capture of traffic between the CM 
and GW for a call drop.

Regards,
Wes

On 5/24/2011 7:41 AM, Gregory Wenzel wrote:
> You mean the calls over a pri? drop after a period of time. We had a 
> very similar problem with a cleint using v4.1. The issue was the site 
> had not yet come up on the dedicated circuit and was operating over a 
> vpn tunnel. They used checkpoint FW end to end was blocking h.245 
> signalling even though the FW engineers swore it was an open tunnel. 
> The phones registered to call manager normally, interoffice dialing 
> over wan worked fine. Calls from that location out the local pri 
> dropped a short time after making it. Also when users dialed in to the 
> local gw there was one way audio. As we worked with the engineers on 
> the checkpoint firewall the one way audio dissapeared but they never 
> quite got the call dropping fixed until we go the mpls up and 
> disconnected the vpn tunnel.
> Hope that helps somewhat for you.
>
> On Mon, May 23, 2011 at 5:37 PM, Ratko Dodevski <rade239 at gmail.com 
> <mailto:rade239 at gmail.com>> wrote:
>
>     Hi, does anyone ever had experienced something like this. Recently
>     I've started to receive complains that calls that go over some of
>     the trunks that we have with other locations fail after exactly 5
>     min and 18 sec. Can anyone try to help me how to determine the
>     reason for the call drops.
>
>     Thanks and regards
>
>     -- 
>     Ratko
>
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>
>
> -- 
> Greg Wenzel, CCVP
>
>
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