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

[Prassana Venu]

Hi For Invite and Refer the From Address may contain an Anonymous uri.
incase the invitee requires anonymouse invite.

On 12/19/05, Sudhansu Sabut <sudhansu_sabut at persistent.co.in> wrote:
>
>
> 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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