Has anyone successfully implementated a client that works with MS LCS/OCS or
a server that works with MS Messenger/Office Communicator?

I'm having a problem with verification and composition of signatures.

According to MS documentation of its SIP extensions :-
The client MUST use the following values in order and enclosed by angle
brackets to construct a secure buffer that is then used to compute the
message signature:
   1.  Authentication method (for example, "NTLM" or "Kerberos")
   2. Crand for client or srand for server
   3. Cnum for client or srand for server
   4. Realm
   5. Targetname
   6. Call ID
   7. CSeq#
   8. CSeq method
   9. From URL
  10. From Tag
  11. To Tag
  12. Expires (optional)
  13. Response code (responses only)

However, a signature created over this data appears to be rejected.  Anyone
know whether this MS documentation accurate?

tia,
Paul
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