[Serusers] SIP server compatibility

[Annie Sasidar]

Hi,
 I am working on windowsce.net4.2. The voip architecture in this OS is
based on SIP (RFC2543). I have been trying to register on the Linux SIP
server running ser using a Provisioning.xml file which has the details
required. I am getting the error " Unable to register, check server
settings". I am running the ser-0.8.12 version on the linux box which is
based on RFC 3261. Do you think there is a compatibility issue here? Does
ser allow clients which are based on older RFC's to register?
Any pointers will be greatly appreciated.

Thanks,
Annie