Re: [Sip] Questions on Max-Forwards

[Ajit Kalele <kalele@mahindrabt.com>]

<Sorry, did a Reply instead of Reply All>

Hi,

>    Alternatively, a server receiving an OPTIONS request with a
Max-
>    Forwards header field value of 0 MAY respond to the request
>    regardless of the Request-URI.
>
> Does it mean that a proxy may send 483 instead of 200?

No, it means that Proxy should send 200 for OPTIONS, even though
the
R-URI doesn't belong to the Proxy.

> What if the value of Max-Forwards is outside the permitted
range
> 0-255?  Should a 400 response be sent?

As per section 16.3 Request Validation, sub-section 3
Max-Forwards check,

"If the request contains a Max-Forwards header field with a
field value
greater than zero, the check is passed."

So ..

For positive values :

I think the Proxy should set it to "69", as if it received it
with a
value "70", and forward the request.

For negative values :

It should send 400 Bad Request.

Best Regards
Ajit

Loh Kok Jeng wrote:

> Hi,
>
> Thanks for your reply.  Section 11 says:
>
>    Alternatively, a server receiving an OPTIONS request with a Max-
>    Forwards header field value of 0 MAY respond to the request
>    regardless of the Request-URI.
>
> Does it mean that a proxy may send 483 instead of 200?
>
> What if the value of Max-Forwards is outside the permitted range
> 0-255?  Should a 400 response be sent?
>
> regards,
> KJ Loh
>
> > -----Original Message-----
> > From: Krishna, Samaga [mailto:samaga.krishna@intel.com]
> > Sent: Wednesday, October 23, 2002 5:53 PM
> > To: 'Loh Kok Jeng'; sip@ietf.org
> > Subject: RE: [Sip] Questions on Max-Forwards
> >
> >
> > Hi Loh,
> >  If proxy receives a request with Max-Forward : 1, the proxy
> > will decrement
> > the count and forward the message.
> > If proxy receives the request with Max-Forward: 0, it should
> > not forward the
> > request. It shall send 483 response. If the request is for
> > OPTIONS, proxy
> > will act as final recipient and respond to it as in the RFC
> > 3261 section 11.
> >
> >
> > have a nice day
> > Prasanna
> >
> >
> >
> > -----Original Message-----
> > From: Loh Kok Jeng [mailto:kokjeng.loh@siemens.com]
> > Sent: Wednesday, October 23, 2002 1:00 PM
> > To: sip@ietf.org
> > Subject: [Sip] Questions on Max-Forwards
> >
> >
> > Dear all,
> >
> > If a valid SIP message with "Max-Forwards: 1" is received by
> > a proxy, should
> >
> > the proxy decrement Max-Forwards and forward it, or should it
> > respond with
> > 483?
> >
> > Likewise, how should the proxy handle a message with with
> > Max-Forwards: 0
> > or a negative value?
> >
> > regards,
> > KJ Loh
> > _______________________________________________
> > Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
> > This list is for NEW development of the core SIP Protocol
> > Use sip-implementors@cs.columbia.edu for questions on current sip
> > Use sipping@ietf.org for new developments on the application of sip
> >
> _______________________________________________
> Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
> This list is for NEW development of the core SIP Protocol
> Use sip-implementors@cs.columbia.edu for questions on current sip
> Use sipping@ietf.org for new developments on the application of sip

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_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors@cs.columbia.edu for questions on current sip
Use sipping@ietf.org for new developments on the application of sip