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The

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system must have the necessary licenses to make calls.

Configuration Steps

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The call flow below depicts an outbound call from Lync to Skype to ITSP via

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SBC 1000/2000.

  • After the initial INVITE from the Mediation server, 
    Spacevars
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    (UA) sends an INVITE request to the ITSP proxy server (UAS).
  • Spacevars
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     then receives 100 Trying and then 401 Unauthorized request from the ITSP proxy server.
  • Spacevars
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    , acting as a UA, then re-sends the request and authenticates itself by including an Authorization header field with the request.
  • The Authorization field value consists of credentials containing the authentication information of the UA for the realm of the resource being requested as well as parameters required in support of authentication and replay protection.
  • The Realm, Username and Password information are taken from the Remote Authorization Table entry based on the username that is provided by the realm provided by the UAS.

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1Call Flow

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Call Debugging Trace

The 

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debug log produced at Trace level will show the information that is used to compute the MD5 string used in the Authorization header:

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