Hi,
Thanks for responce.
Please see section 20 of RFC 3261.
where R is defined as:
R: header field may only appear in requests;
Thanks And Regards,
Satyendra Tiwari
Alcatel-Lucent
On Fri, 02 Mar 2007 Attila Sipos wrote :
> >> Please check the table listed in sec 20.1 which says
> >> Max-Forwards R amr m m m m m m
> >>and
> >>
> >>m: The header field is mandatory.
>
>
>R: for requests only.
>
>
>
>To try to clarify this, proxies look at the Max-Forwards
>header when forwarding a request.
>see "16.3 Request Validation", subsection "3. Max-Forwards check"
>
>and "16.6 Request Forwarding", subsection "3. Update the Max-Forwards header
>field"
>
>Proxies do not care about Max-Forwards in SIP responses.
>
>
>UA's do not care about ANY received Max-Forwards either.
>They only have to set a value when they send a SIP request.
>
>Regards,
>Attila
>
>
>
>-----Original Message-----
> From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] Behalf Of Prithvi
>Sent: 02 March 2007 12:36
>To: Stephen Paterson
>Cc: [email protected]
>Subject: Re: [Sip-implementors] Max-Forward Header
>
>
>Hi Stephen
>
> Please check the table listed in sec 20.1 which says
> Max-Forwards R amr m m m m m m
>and
>
>m: The header field is mandatory.
>
>
>
>Example:
>
> Header field where proxy ACK BYE CAN INV OPT REG
> ___________________________________________________________
> Accept R - o - o m* o
> Accept 2xx - - - o m* o
> Accept 415 - c - c c c
> Accept-Encoding R - o - o o o
> Accept-Encoding 2xx - - - o m* o
> Accept-Encoding 415 - c - c c c
> Accept-Language R - o - o o o
> Accept-Language 2xx - - - o m* o
> Accept-Language 415 - c - c c c
> Alert-Info R ar - - - o - -
> Alert-Info 180 ar - - - o - -
> Allow R - o - o o o
> Allow 2xx - o - m* m* o
> Allow r - o - o o o
> Allow 405 - m - m m m
> Authentication-Info 2xx - o - o o o
> Authorization R o o o o o o
> Call-ID c r m m m m m m
> Call-Info ar - - - o o o
> Contact R o - - m o o
> Contact 1xx - - - o - -
> Contact 2xx - - - m o o
> Contact 3xx d - o - o o o
> Contact 485 - o - o o o
> Content-Disposition o o - o o o
> Content-Encoding o o - o o o
> Content-Language o o - o o o
> Content-Length ar t t t t t t
> Content-Type * * - * * *
> CSeq c r m m m m m m
> Date a o o o o o o
> Error-Info 300-699 a - o o o o o
> Expires - - - o - o
> From c r m m m m m m
> In-Reply-To R - - - o - -
> Max-Forwards R amr m m m m m m
> Min-Expires 423 - - - - - m
> MIME-Version o o - o o o
> Organization ar - - - o o o
>
> Table 2: Summary of header fields, A--O
>
>
>
>
>
>
>Rosenberg, et. al. Standards Track [Page 162]
>
>RFC 3261 SIP: Session Initiation Protocol June 2002
>
>
> Header field where proxy ACK BYE CAN INV OPT REG
> ___________________________________________________________________
> Priority R ar - - - o - -
> Proxy-Authenticate 407 ar - m - m m m
> Proxy-Authenticate 401 ar - o o o o o
> Proxy-Authorization R dr o o - o o o
> Proxy-Require R ar - o - o o o
> Record-Route R ar o o o o o -
> Record-Route 2xx,18x mr - o o o o -
> Reply-To - - - o - -
> Require ar - c - c c c
> Retry-After 404,413,480,486 - o o o o o
> 500,503 - o o o o o
> 600,603 - o o o o o
> Route R adr c c c c c c
> Server r - o o o o o
> Subject R - - - o - -
> Supported R - o o m* o o
> Supported 2xx - o o m* m* o
> Timestamp o o o o o o
> To c(1) r m m m m m m
> Unsupported 420 - m - m m m
> User-Agent o o o o o o
> Via R amr m m m m m m
> Via rc dr m m m m m m
> Warning r - o o o o o
> WWW-Authenticate 401 ar - m - m m m
> WWW-Authenticate 407 ar - o - o o o
>
>regards
>Prithvi
>
>
>Stephen Paterson wrote:
> > Hi Prithvi,
> >
> > The passage you quote states that, 'all of these header fields are
> > mandatory in all SIP requests'. That is, not all SIP messages, only
> > requests. They are not necessarily mandatory for responses (although some
> > are). Tables 2 & 3 (pages 162 & 163 RFC 3261) shows that Max-Forwards is
> > only relevant for requests.
> >
> > Regards
> >
> > Steve
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] Behalf Of Prithvi
> > Sent: 02 March 2007 05:43
> > To: Satyendra Tiwari
> > Cc: [email protected]
> > Subject: Re: [Sip-implementors] Max-Forward Header
> >
> >
> > Hi Satya
> > Maxforward is mandatory in all SIP messages see 8.1.1 for more info
> >
> > 8.1.1 Generating the Request A valid SIP request formulated by a UAC
> > MUST, at a minimum, contain the following header fields: To, From, CSeq,
> > Call-ID, Max-Forwards, and Via; all of these header fields are mandatory
> > in all SIP requests. These six header fields are the fundamental
> > building blocks of a SIP message, as they jointly provide for most of
> > the critical message routing services including the addressing of
> > messages, the routing of responses, limiting message propagation,
> > ordering of messages, and the unique identification of transactions.
> > These header fields are in addition to the mandatory request line, which
> > contains the method, Request-URI, and SIP version.
> >
> > Regards
> > Prithvi
> >
> > Satyendra Tiwari wrote:
> >
> >> Hello,
> >>
> >> Is Max-Forward header mandatory in SIP responces?
> >> If optional then why?
> >>
> >>
> >>
> >>
> >>
> >> Thanks And Regards,
> >> Satyendra Tiwari
> >> Alcatel-Lucent
> >> _______________________________________________
> >> Sip-implementors mailing list
> >> [email protected]
> >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
> >>
> >>
> >>
> >
> > _______________________________________________
> > Sip-implementors mailing list
> > [email protected]
> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
> >
> >
>
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