Goal (short description)

TLS authentication between the User Agent and the SIP proxy, for Microsoft Live Communication Server 

Applicability

Prerequisites (OS, dependencies on other software)

OS: MS windows server 2003 SP1

...

SIP UA: MS Windows Messenger 5.1 or Office Communicator

Configuration (OS agnostic)

see

http://www.microsoft.com/technet/prodtechnol/office/livecomm/library/deployse/lcsdse_7.mspx

OS specific help

Validation, confirmation tests

In MS Windows Messenger 5.1 (or similar in Office Communicator) choose:

Tools ->

Options ->

...

enable 'my contacts include users of a SIP communications service' and fill in under 'sign-in name:' <username>@<domain>

register with the LCS server. If it succeeds, your configuration is valid.