ring back timer

Unanswered Question
Jan 13th, 2009

Hello Guys.

We are experiencing troubles with incoming calls that normally takes 8 seconds to return the ring back to the person that is calling from the pstn. We discussed with the telco guys about this issue and they said that this delay is because of the router, which takes to long to answer wit the ring back. Do you have any idea that something that could solve this issue in call manager or router?

Thanks.

I have this problem too.
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Jaime Valencia Tue, 01/13/2009 - 19:28

GW? H323? MGCP?

CUCM? CME? versions?

had discarded overlapping DNs?

not enough info to provide any help

java

Gilberto Marcos Thu, 01/15/2009 - 12:29

Hello.

The call comes as follow:

pstn--H323gateway--call manager 6.1(1)--Ipphone.

Telco guys said that when the router received the last digits that the pstn user dialed, it takes 8 seconds to call to be completed.

This guys are telling that they can not modify anythig at their side, because the router is the one which presents this delay.

Thanks.

Gilberto Marcos Thu, 01/15/2009 - 12:28

Hi Nick.

The call comes as follow:

pstn--H323gateway--call manager 6.1(1)--Ipphone.

Telco guys said that when the router received the last digits that the pstn user dialed, it takes 8 seconds to call to be completed.

This guys are telling that they can not modify anythig at their side, because the router is the one which presents this delay.

Thanks.

Nicholas Matthews Thu, 01/15/2009 - 12:38

A couple of things you can try:

If you have a PRI ( your diagram does not indicate what type of PSTN interface you have )

try this:

Serial0/0/0:23

no isdn overlap-receiving

On CUCM:

MTP required

Enable outbound fast-start

hth,

nick

Nicholas Matthews Mon, 01/19/2009 - 13:48

You can still use those commands, as they are H323 commands.

However, E1 R2 has the tendency to be a very slow protocol. To troubleshoot this problem you would want to pull gateway traces as well as CUCM traces to see what's going on.

hth,

nick

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