[SIPForum-discussion] SIP "From" header field question

[Klaus Darilion]

mtsai at sunrisetelecom.com wrote:
> Hi,
> 
> RFC3261 says the "From" header field can be the format of
> "sip:user at hostname", where hostname can be a domain name or an IP
> address:
> 
> 1. Should it be the IP address of the local UA, or the registrar, or
> the outbound proxy? Is there any specification describing this?
> RFC3261does not seem to clarify this. 

It should be a SIP URI which can be used for calling back (e.g the 
adress-of-record).

regards
klaus

> 2. Is there any difference for
> the "From" among different SIP messages(INVITE, REGISTER, and
> others)?
> 
> Thanks in advance!
> 
> 
> Matt
> 
> 
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