SIP Server Requirements
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8/28/2008
This topic details server requirements for SIP sessions in the following configurations.
For PC-PC and Text Messaging sessions
If the SIP URL uses an e-mail-like format, a SIP proxy server can be used to initiate the session.
If a SIP server is not available, the client can perform a DNS lookup to find the location.
If the address is an IP or machine name, a proxy server is not needed to initiate or maintain the call.
Presence information
All session types can take advantage of presence information about other users.
A SIP registrar server is required when presence information is desired. Users can register their presence information with the server and retrieve the presence information of others with this service.