[SR-Users] Best way to handle OPTIONS message with Max-Forwards of 0

[Klaus Darilion]

IMO RFC 3261 does not cleary state that this OPTIONS request should be
answered with 200 OK.

Anyway, if the SBC wants 200 OK, then send 200 OK :-)

klaus

Am 08.06.2011 21:49, schrieb Sean O'Donnell:
> Thanks for the reply.
> 
> In our case, the SBC treated the 483 as an error of some sort and wouldn't send
> traffic.  It wanted a 200/OK.
> 
> Anyway, I thought that when a proxy responds to an OPTIONS, its supposed to
> answer with a 200/OK (3261 11.2).  Is that correct?
> 
> Sean O'Donnell
> 
> 
> 
> 
> ---- On Wed, 8 Jun 2011, Klaus Darilion (klaus.mailinglists at pernau.at) wrote:
> 
> What is the problem with the default config?
> 
> The proxy will respond with 483 as the standard defines. I guess the SBC
> will doe this to check if the proxy is alive and will accept any
> response as "the proxy is alive".
> 
> regards
> Klaus
> 
> 
> Am 08.06.2011 18:28, schrieb Sean O'Donnell:
>> Hi:
>>
>> We're running kamailio 1.5.5 as part of our VoIP infrastructure.  One of our
>> service providers
>> has an SBC that sends an OPTIONS messages with a Max-Forwards of 0.
>>
>> Looking at RFC 3261 section 11, this seems to be a valid method of forcing the
>> proxy to respond to the OPTIONS.
>> However, the standard initial sanity checks in most proxy configs will reject
>> this message.  I fixed our script
>> by changing to this:
>>   
>>         # initial sanity checks -- messages with
>>         # max_forwards==0, or excessively long requests
>>         if (!mf_process_maxfwd_header("10")) {
>>                 if( method != "OPTIONS" ) {
>>                         sl_send_reply("483","Too Many Hops");
>>                         return;
>>                 };
>>         };
>>         if ( msg:len > max_len ) {
>>                 sl_send_reply("513", "Message too big");
>>                 return;
>>         };
>>
>> but does anyone have a better solution?
>>
>> Thanks,
>>
>> Sean O'Donnell
>>
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> 
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> 
> 
> 
> 
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users