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Unable to establish calls from MOC to Cisco IP phones and vice versa, error Reason: Q.850;cause=47 RRS feed

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    Hello

    We are trying to get MOC to dial out to a Cisco IP phone and vice versa.


    Here is our setup:

    IP phone--->CUCM--->Cisco ISR---> Mediation Server--->MOC

    The ISR strips the + before sending to CUCM

    When we dial from MOC, we see in the mediation server log:

    >>>>>>>>>>>>Outgoing SipMessage c=[<SipTcpConnection_2BDA441>], MediationServerIP:61771->X.X.X.X:5060
    INVITE sip:1001@X.X.X.X;user=phone SIP/2.0
    FROM: <sip:+71234@medsrv1.pocforest.com;user=phone>;epid=2EA5FE8684;tag=3b80625422
    TO: <sip:1001@X.X.X.X;user=phone>

    where X.X.X.X is the Cisco ISR 12.4t gateway

     

    SIP/2.0 100 Trying
    FROM: <sip:+71234@medsrv1.pocforest.com;user=phone>;epid=2EA5FE8684;tag=3b80625422
    TO: <sip:1001@X.X.X.X;user=phone>

    SIP/2.0 180 Ringing
    FROM: <sip:+71234@medsrv1.pocforest.com;user=phone>;epid=2EA5FE8684;tag=3b80625422
    TO: <sip:1001@X.X.X.X;user=phone>;tag=5DBE5F74-169C


    PRACK sip:1001@X.X.X.X:5060;transport=tcp SIP/2.0
    FROM: <sip:+71234@medsrv1.pocforest.com;user=phone>;epid=2EA5FE8684;tag=3b80625422
    TO: <sip:1001@X.X.X.X;user=phone>;tag=5DBE5F74-169C

     

    Finally it errors out

    TL_INFO(TF_PROTOCOL) [3]0A90.091C::01/16/2010-14:42:21.556.00001b08 (S4,SipMessage.DataLoggingHelper:sipmessage.cs(581))
    <<<<<<<<<<<<Incoming SipMessage c=[<SipTcpConnection_2BDA441>], MediationServerIP:61771<-X.X.X.X:5060
    SIP/2.0 503 Service Unavailable
    FROM: <sip:+71234@medsrv1.pocforest.com;user=phone>;epid=2EA5FE8684;tag=3b80625422
    TO: <sip:1001@X.X.X.X;user=phone>;tag=5DBE5F74-169C
    CSEQ: 4 INVITE
    CALL-ID: 4147a86b-59eb-40e2-8442-39b2476dfc23
    VIA: SIP/2.0/TCP MediationServerIP:61771;branch=z9hG4bK4ee81ee
    ALLOW-EVENTS: telephone-event
    CONTENT-LENGTH: 0
    DATE: Sat, 16 Jan 2010 14:44:35 GMT
    SERVER: Cisco-SIPGateway/IOS-12.x
    Reason: Q.850;cause=47
    ------------EndOfIncoming SipMessage


    The phone rings but as soon as we pick it up, the call disconnects.

    Please can someone guide what may be the issue on Cisco side?

     

    ~Abdul Aziz
    Saturday, January 16, 2010 4:12 PM

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