----- Original Message -----
From: "Ramachandran Iyer" <[EMAIL PROTECTED]>
To: "Bob Penfield" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>
Sent: Monday, March 11, 2002 4:50 PM
Subject: Re: [Sip-implementors] INVITE contact header
>
> hi bob,
> According to bis-09 (8.1.1 Generating Request) it clearly states that the
MUST headers in a
> request are ( To, From, CSeq, Call-Id, Max-Forwards and Via ) it does not
mention the
> Contact header being part of this Mandatory list.
This is correct. This text is talking about the contsruction of any kind of
SIP request, not specifically an INVITE.
> But i can also see that in (8.1.1.8 Contact ) it says, Contact header
field MUST be present...
> a contradiction...
There is no contradiction. It says that Contact MUST be present in any
request that can result in the establishment of a dialog (i.e. an INVITE).
If the request does not establish a dialog (e.g. OPTIONs or BYE), it does
not need a Contact header.
> I would think the later part to be a mistake, as even if there is no
Contact sent it should be ok.. as there
> is always the From: where the response can be sent back. Contact to me is
more of a specification from
> the client side of where he would want the subsequent responses to be sent
to from the server.
>
> Rama
>
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