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New Member

Call stay for 4 minutes when wan lost

Centralized CCM . Remote office use H323 and SRST.

When WAN lost, we found the active call can stay 4-4.5 minutes then call dropped.

If WAN restored, call established during the SRST mode will stay for ever.

Anybody know why it only can last around 4 minutes. Is something related with the H225 idle time?

Thanks

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5 REPLIES
Cisco Employee

Re: Call stay for 4 minutes when wan lost

Please see CSCdx26761.

You're on the right track. Currently, TCP keepalives are enabled for established h225 sessions. When the WAN goes down, TCP keepalives will be lost between the SRST GWY and the CCM, the SRST gwy will terminate active calls after about 4 minutes.

Fix for this requires a new CLI which make this timer a configurable h323 parameter.

-ben

Blue

Re: Call stay for 4 minutes when wan lost

I would suggest moving to MGCP. This will allow those same calls to stay up.

Re: Call stay for 4 minutes when wan lost

but on a MGCP gateway with E1 PRI and SRST,

the call gets dropped when WAN disconnects...

New Member

Re: Call stay for 4 minutes when wan lost

I had same issue when use MGCP. The reason for that is Cisco use Q931 haulback to CCM, when wan lost Q931 can't be maintained through GW. Call drops. Having said that, from call preservation point MGCP even worse than H323?Any other comment?

Thanks

New Member

Re: Call stay for 4 minutes when wan lost

Which version support this new command? Has it been released? The bug shows no workaround now. Thanks

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