sip/2.0 503 service unavailable reason q.850 cause=47 and SIP/2.0 500 Internal Server Error Reason: Q.850;cause=63

[anilkumar.cisco]

Hello Friends,

getting the below error while tracing SIP Logs..

not sure what is the issue..

sip/2.0 503 service unavailable reason q.850 cause=47 and SIP/2.0 500 Internal Server Error Reason: Q.850;cause=63

HQ CUCM- publisher and subscriber- Extention : 2001 and 2002

BR1- Publisher only- Extention: 3001 and 3002

BR2-CME extention : 4001

HQ Router acting as CUBE.

Pls help .

[Abhay Singh Reyal]

If I am not wrong then you are trying to call from CME to HQ CUCM by using HQ router as CUBE and want the media flow to occur from the cube. This is what I have understood as per the config. If the call is not working from 4001 to 2001 or 2002. Try configure a test dial-peer as below. 

dial-peer voice 222 voip
preference 1
destination-pattern 2...
session protocol sipv2
session target ipv4:IP of CUCM
incoming called-number 2...
codec g711ulaw

Also it will be great if you can provide the debug voip ccap inout and debug ccsip messages from both HQ and BR2 if the call fails. 

HTH

Regards

Abhay

[anilkumar.cisco]

thanks Abhay for your quick reply..

the problem get resolved after giving the below command in incoming HQ CUBE router dial peer toward HQ CUCM and outgoing dial peer toward BR1 and BR2 router..

voice-class sip pass-thru content sdp

Not sure.. how this command has helped here.

It would be great if you explain it in details..

Best Regards
Anil Singh

[Abhay Singh Reyal · Accepted solution]

You have used a feature for the calls to traverse a CUBE in SDP passthrough flow-through mode.So, eventually it passes the Session Description Protocol (SDP) transparently from in-leg to the out-leg with no media negotiation.

HTH

Regards

Abhay