[Serusers] Not been able to log on

[Annie Sasidar]

Hi,
  I am using windows messenger 5.0. This version supports SIP but i am not
able to log on as a first time user. The error i get is :
You have been signed out of SIP communications service because that service
has been temporarily shut down. Please try again later.

Is there any other free SIP client that experts could advice which works
with SER 0.8-11.


Thanks in advance,
Annie