SIP/2.0 503 Service Unavailable

metalium2007 · ‎10-07-2008

hello,

I have a sip trunk from ccm 5.x to an operator gateway and can make calls to pstn without problems.

The problem is that when i receive a call from the sip gateway via the sip trunk, the call manager sends SIP/2.0 503 Service Unavailable.

NOTE: i receive the full number from the trunk and convert it to the extension via translation-pattern.

Is there any special configuration to solve this issue in inbound calls?

Thank you,

Met.

irisrios · ‎10-13-2008

Try to enable inbound/outbound H323 Faststart on the CallManager.

metalium2007 · ‎10-13-2008

but in the sip trunk config that options does not exist...right?

Thanks!

kinwai · ‎10-14-2008

what about trying setting "MTP required" to yes?

is it enabled in the first place?

metalium2007 · ‎10-14-2008

yes it is.

tnx.

metalium2007 · ‎10-23-2008

can't anyone point a direction?

SIP/2.0 503 Service Unavailable

Warning: 399 "Routing Failed:..."

Only in Incoming calls from SIP Gateway to CUCM. Outgoing calls are OK.

Thanks,

Met.

metalium2007 · ‎10-23-2008

can't anyone point a direction?

SIP/2.0 503 Service Unavailable

Warning: 399 "Routing Failed:..."

Only in Incoming calls from SIP Gateway to CUCM. Outgoing calls are OK.

Thanks,

Met.

metalium2007 · ‎10-30-2008

Ok. Problem solved.

Provider provided sip gateway local address and didnt have nat to their public address.

After establishing SIP trunk between CUCM cluster and public sip address, calls work incoming and outgoing.

Thanks for suggestions,

Regards,

Met.