Hi, guys!

I have a question about the To header field of a SIP request, maybe there is 
some misunderstanding, I hope some of you will kindly make clear for me. Thanks 
in advance!


When describing how to populate the To field of a SIP request, RFC 3261 states 
in section 8.1.1.2 that:


"...Frequently, *the user will not enter a complete URI*, but rather a string 
of digits or letters (for example, "bob"). It is at the discretion of the UA to 
choose how to interpret this input...."


This implies that the user will not enter the domain to the right-hand-side of 
the at-sign in the SIP URI (Am I right?). But RFC3261 continues to state that:


"Using the string to form the user part of a SIP URI implies that the UA wishes 
the name to be resolved in the domain to the right-hand side (RHS) of the 
at-sign in the SIP URI (for instance, sip:[email protected])."


My question is: since *the user does NOT enter the complete URI*, how does the 
UA know what the domain to the RHS of the at-sign in the SIP URI is? How does 
the UA know in what domain is the name to be resolved?




Best regards,


ZHANG
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