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New Member

SIP TRUNK (incoming calls not working, outbound OK)

Hello,

When configuring a Sip trunk with cucm 5.1.2(3000) to an operator sip gateway outbound calls work correctly.

When trying to get an inbound call, the gateway receives the following from CUCM:

--------------------------------

SIP/2.0 503 Service Unavailable

Warning: 399 "Routing Failed:..."

--------------------------------

And a fast busy signal is given to the caller.

What does this message means, and how can i debug and solve the problem.

I'm really stuck.

Thanks,

Met.

7 REPLIES

Re: SIP TRUNK (incoming calls not working, outbound OK)

Make sure your SIP trunk has a Calling Search Space for inbound calls that can reach the required DN, translation pattern, etc.

Hope this helps.

Brandon

New Member

Re: SIP TRUNK (incoming calls not working, outbound OK)

Dear friend,

Ive checked that. And it should reach the DN. I don't understand what can be my problem since the message routing failed is not explicit.

Thanks,

Met.

Re: SIP TRUNK (incoming calls not working, outbound OK)

What do you have for "Significant Digits" for incoming calls? What number is being sent by the providor? Does this number and the significant digits that you are matching match a DN?

Brandon

New Member

Re: SIP TRUNK (incoming calls not working, outbound OK)

- 9 significant digits

Then they are transformed into a DN (5 digits) via translation pattern.

(checked the transformation dialing from another phone and it works)

Thanks,

Met.

Re: SIP TRUNK (incoming calls not working, outbound OK)

Be sure the Calling Search Space assigned to the SIP trunk can reach the Partition assigned to the translation pattern and the Calling Search Space assigned to the translation pattern can reach the Partition assigned to the DN.

Brandon

New Member

Re: SIP TRUNK (incoming calls not working, outbound OK)

Ok, im 99% sure of that, but ill check anyway.

Any service or service parameter that i should use? Anything related with tcp and udp on sip security profile? i'm using the default.

Thanks,

Met.

New Member

Re: SIP TRUNK (incoming calls not working, outbound OK)

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.

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