[cisco-voip] Increasing the timer for ring back from a PSTN provider?

[dominguez herrera sergio andres]

Im sorry I dint include a subject in my last mail.
Please follow this thread rather than the previous one.

Im having a problem in one of our callmanager clusters. This cluster 
has one H323 gateway connected through an E1 digital trunk to this 
particular provider.

When users dial some long distance calls, the PSTN provider takes too 
long in returning a ring back to the gateway, the user then hears a 
fast busy tone rather than a ring.

This problem happens with this provider only, we use other PSTN 
providers in our others clusters and we dont experience this problem 
when dialing the same long distance numbers.

I have opened a Trouble Ticket with the PSTN provider and they have 
told me that our PBX is disconnecting the call too soon, and that our 
PBX should give them some more time before assuming the call could not 
be completed.

My question is, is there a way to increase the time a gateway waits for 
a ring back from the provider? Is this a CallManager configurable 
setting or is it an IOS setting? I guess it is an IOS setting, but I 
cant fugure out which one is it, I dont seem to find anything related 
in dial-peer configuration mode.

Many thanks for your help.