i have Cisco call manager connected to PBX via 2811 through VIC2-2BRI, the problem is sometimes the outgoing call does not pass and when i make trace, it displays what you will find in attachement.you will also find in attachement the confgiuration of the 2811 Gateway.
From the traces do it does not look possible that the T310 timer is expiring before the ISDN status changes to Alerting, which would consequently cause the gateway to release the call.
Could you post the output from 'show isdn timers', simply to verifiy the the timer is configured correctly. Either way the time between Call Proceeding and Release is very small, so even if the timer was configured incorrectly it still does not explain why the call could not be completed.
One aspect which is evident, is the fact that the trace indicates that no Connect message was sent by telco/pbx when the called party answered.
Is possible for you trace the user side in this case an determine whether the pbx is sending a connect message.
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