UC520 outgoing works, incoming calls do not ( SIP )

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Feb 13th, 2009
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We recently upgraded our UC to UC520-4.2.9 EA, incomming calls worked just fine.

Anyways our UC is behind an ASA no changes have been made the ASA

A debug of the sip messages shows that after the inital invite message the UC returns a 500 Internal Server Error with Reason: Q.850;cause=63


shows a "63" as:

Service or option not available, unspecified - Typical scenarios include: Service not available. - Reports a service or option not available event only when no other cause in the service or option not available class applies.

I am lost on how to debug this one. any ideas??

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Marcos Hernandez Fri, 02/13/2009 - 15:42
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Can you post a full "debug ccsip message" for a failed call?

Couple of other questions:

1) Does the ASA have a public IP and is it configured for NAT?

2) Have you checked the ACL on interface fast Ethernet 0/0 (typically 104) ?


Marcos Hernandez
Technical Marketing Engineer
Cisco Systems, Inc.


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