Hi, everyone!

I am a newcomer to SIP and I have a problem with Section 8.1.1.2 of RFC3261.


Following is a short qoute from Section 8.1.1.2 of RFC 3261 (I enclosed the key 
sentence within asterisks to make them stand out):


"A UAC may learn how to populate the To header field for a particular request 
in a number of ways... Frequently, the user will not enter a complete URI, but 
rather a string of digits or letters (for example, "bob"). ...*** The RHS will 
frequently be the home domain of the requestor, which allows for the home 
domain to process the outgoing request."***


As far as I know, when Alice (whose SIP URI is [email protected]) is trying to 
call Bob (whose SIP URI is [email protected]), her UA will (at least initially) 
populate the To header field of the outgong INVITE with [email protected]. But 
according to the above quote enclosed in asterisks, when sending outgoing 
request to Bob, Alice (the requestor) will FREQUENTLY inclue [email protected] 
in the To header field, where atlanta.com is Alice's home domain. What does 
this mean? I am really confused :-(


Anyone please help me out with this, thank you very much!


Regards!


Zhang
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