[SR-Users] Wrong Call-ID and tags in response to OPTIONS

[Jean-Marie Baran]

Hi,

I am trying to get Kamailio working with a third party SIP provider. 
This provider pings Kamailio with OPTIONS messages, but Kamailio does 
not answer correctly: the Call-ID and the tags change where they should 
not. Here is an example:

Third party SIP server:

OPTIONS sip:false.sip.provider:5060 SIP/2.0
Via: SIP/2.0/UDP 197.17.144.4:5060;branch=z9hG4bK8e45ac1463a
From: <sip:197.17.144.4>;tag=1669836943
To: <sip:false.sip.provider>
Date: Fri, 07 Aug 2015 12:34:37 GMT
Call-ID: a012e080-5c41a5ce-8e5-38512c6 at 197.17.144.4
User-Agent: Cisco-CUCM10.5
CSeq: 101 OPTIONS
Contact: <sip:197.17.144.4:5060>
Max-Forwards: 0
Content-Length: 0

Kamailio's answer:

SIP/2.0 200 OK
Via: SIP/2.0/UDP 
197.17.144.4:5060;branch=z9hG4bK93e5f072f5f;received=174.37.217.1
From: <sip:197.17.144.4>;tag=298911055
To: <sip:false.sip.provider>;tag=b27e1a1d33761e85846fc98f5f3a7e58.8c24
Call-ID: 2defcb00-5c41aa17-93f-38512c6 at 197.17.144.4
CSeq: 101 OPTIONS
Server: kamailio (4.3.1 (x86_64/linux))
Content-Length: 0

You can see that the Call-ID change from "a012e080-5c41a5ce-8e5-38512c6" 
to "2defcb00-5c41aa17-93f-38512c6". Likewise, the From tag change 
("1669836943" to "298911055"). What could be the reason for this ?
Moreover I think Kamailio should add the field Allow (with 
INVITE,ACK,BYE,CANCEL,INFO,OPTIONS,REFER,SUBSCRIBE,NOTIFY), but it does not.

I should mention that I had to modify /kamailio.cfg/ to have Kamailio 
answer to OPTIONS messages (I added *the code in bold*):

if (*!is_method("OPTIONS") && *!mf_process_maxfwd_header("10")) {
         sl_send_reply("483","Too Many Hops");
         exit;
}

if(is_method("OPTIONS") && uri==myself && $rU==$null) {
*#* sl_send_reply("200","Keepalive");
*options_reply();*
         exit;
}

Maybe this hack replaces an expected behavior that I failed to 
see/configure ?

Thanks,
Jean-Marie.
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