Re: Sip 503 service unavailable and sip 500 internal server erro
As we see that the gateway is sending 503 Service Unavailable and it is communicating over H323 with the CUCM, please provide the following debugs as well with the 'deb ccsip messages' to isolate if the disconnect is being received from the other leg or by the gateway itself.
1. debug voip ccapi inout
2. debug h225 asn1
3. debug h245 asn1
Also, we see that the SDP in the invite from the provider supports G.729a, G.729ab and G.729b only. The dial peers for the SIP leg is hardcoded with G711ulaw only.
Please try to configure a new voice class codec for support of G.729a, G.729ab and G.729b and G711ulaw. Then, add it to the inbound dial peers (SIP leg).
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