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This article describes the steps necessary to configure the 

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with a SIP peer or with an Internet Telephony Service Provider (ITSP) that requires digest authentication with 401 Unauthorized challenge.

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

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SBC 1000/2000.

  • After the initial INVITE from the Mediation server, 
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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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