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

[Sudhansu Sabut]

Hi,
Please find the answer inline.
Hope this will answer your doubts.

Regds,
Sudhansu

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.

>>>> In case of FROM, it should be the user's registrar domain i.e. the
domain/IP address of the Registrar to which the user is registered with.

2. Is there any difference for the "From" among different SIP
messages(INVITE, REGISTER, and others)?

>>>FROM the public URI of the user trying to register itself or originating
a call. So it's always the public SIP address of the originating user.
There is no difference in FROM among different SIP message as such.

Thanks in advance!


Matt


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