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Problem with cisco 7.1.Need Help!!!


    When we are making a call from Cisco 7.1 call manager INVITE goes from Cisco 7.1 call manager

PBX to NBS(Media Gateway) and NBS responds with 100Trying.
But PBX is sending back the same INVITE message to NBS its not accepting 100 Trying.
Samething is happening even when 200OK comes instead of sending ACK its sending INVITE again.Any Suggestions what may be the issue here.We are not able to test anything using CUCM 7.1.

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Re: Problem with cisco 7.1.Need Help!!!

        Use of Early Media

While the PSTN provides inband progress information to signal early media (such as a ring tone or a busy signal), the same thing does not occur for   SIP. The originating party includes Session Description Protocol (SDP) information, such as codec usage, IP address, and port number, in the outgoing INVITE message. In response, the terminating party sends its codec, IP address, and port number in a 183 Session Progress message to indicate possible early media.

The 183 Session Progress response indicates that the message body contains information about the media session. Both 180 Alerting and 183 Session Progress messages may contain SDP, which allows an early media session to be established prior to the call being answered.

When early media needs to be delivered to SIP endpoints prior to connection, Cisco Unified Communications Manager always sends a 183 Session Progress message with SDP. Although Cisco Unified Communications Manager does not generate a 180 Alerting message with SDP, it does support the 180 Alerting message with SDP when it receives one.

The SIP Profile Configuration window contains a Disable Early Media on 180 check box. Check the check box to play local ringback on the called phone and connect the media upon receipt of the 200OK response.

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