This article describes the steps necessary to configure the  with a SIP peer or with an Internet Telephony Service Provider (ITSP) that requires digest authentication with 401 Unauthorized challenge.

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This document assumes that you have already created a Signaling Group and a SIP Server table for the ITSP.

Software Version

Verify that your  is loaded with the correct boot image version and that your SBC Edge base software version is at least version 2.0.0, build 108.

System Licenses

The  system must have the necessary licenses to make calls.

Configuration Steps

The configuration is comprised of three overall steps:

  1. Add a Remote Authorization Table

  2. Add a Remote Authorization entry

  3. Assign the Remote Authorization Table to the SIP Server Table

Additional Information

Call Flow

The call flow below depicts an outbound call from Lync to ITSP via Sonus SBC 1000/2000.


Call Debugging Trace

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

[2012-04-12 16:17:40,303] 5688 0001 TRACE (Credentials.cpp:451) - computeResponse: creating credentials:
   algorithm : "MD5"
   userName  : "d8Er27ScWIQ"
   passWord  : "uw83i29BeY3x"
   realm     : "ITSPRealm"
   nonce     : "ITSPRealmDe98wSj8euJdU8SHs8"
   cNonce    : "baea32a3"
   nonceCount: "00000001"
   qop       : "auth"
   method    : "INVITE"
   uri       : "sip:15105742474@;user=phone"