[SIPForum-discussion] Max forwards geting added by proxies

[Vijay Kumar]

Hal F. Gottfried
Agreed, but my question is that why Proxy should add it.
If an outbound proxy gets a request from a UAC then it may add it  no
problem.
Can intermediate proxy do this?
Regards
Vijay
*
*
On Wed, Jan 23, 2013 at 4:59 AM, Gottfried, Hal F <hal.gottfried at verizon.com
> wrote:

> Vijay –****
>
> I believe the wordings of the RFC are slightly ambiguous when it comes to
> the use of the Max-Forwards field.  There was a time when this field was
> optional although now it has become mandatory. Max-Forwards limits the
> number of hops a request can make on the way to its destination. It
> consists of an integer, normally 70 that is decremented by one at each hop.
> If the Max-Forwards value reaches 0 before the request reaches its
> destination, it is rejected with a 483 (Too Many Hops) error response. ***
> *
>
> ** **
>
> The real use behind the Max-Forwards mechanism is in that it allows the
> preventing of a message from entering into an endless loop between a set of
> proxies.****
>
> ** **
>
> I hope this helps.****
>
> ** **
>
> *Hal F. Gottfried*
>
> Sr Consultant, Contact Center Consulting & Services****
>
> ** **
>
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *Vijay Kumar
> *Sent:* Tuesday, January 22, 2013 3:25 AM
> *To:* discussion at sipforum.org
> *Subject:* [SIPForum-discussion] Max forwards geting added by proxies****
>
> ** **
>
> Agreed as per RFC 3261 Sec 8.1.1.6   " Max forward is Mandatory header
> feild in SIP Requests****
>
> UAC MUST insert it."****
>
> ** **
>
> But as per 16.6 ****
>
> ** **
>
> "If the copy does not contain a Max-Forwards header field, the proxy MUST
> add****
>
> one with a field value, which SHOULD be 70."****
>
> ** **
>
> My questions****
>
> 1.If MAx forwards is a Mandatory parameter then why should proxy add it.(
> If UAs are not able to add it). ****
>
> ** **
>
> 2. As per 3261 if Max forward Is not added by UAC then SIP outbond proxy
> Must add Maxforward header feild.****
>
>     Can Max-forwarded be added by intermediate proxies as wel l???****
>
> ** **
>
> (If yes i feel the  purpouse of Max forwards header feild  does not serve
> the purpose.)****
>
> ** **
>
> Enlighten me please****
>
> Thanks in Advance****
>
> Vijay****
>
> ** **
>
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