[OpenSIPS-Users] sl question.

johan johan at democon.be
Mon Sep 12 15:03:59 UTC 2022 

so the question is how can I do a forward message to an ip port without
opensips rewriting the uri of ACK in stateless mode ? 

On 12/09/2022 16:55, johan wrote:
>
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_msg: SIP Request:
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_msg:  method:  <ACK>
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_msg:  uri:    
> <sip:+32478720104 at x.y.z.t:*11000*;transport=udp;alias=x.y.z.t~11000~1>
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_msg:  version: <SIP/2.0>
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_headers: flags=ffffffffffffffff
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_via_param: found param type 232, <branch> =
> <z9hG4bK-2487-1-5>; state=16
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_via: end of header reached, state=5
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_headers: via found, flags=ffffffffffffffff
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_headers: this is the first via
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_to_param: tag=4SpHB6a416Ucg
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_to_param: end of header reached, state=13
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:_parse_to: end of header reached, state=29
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:_parse_to: display={sut},
> ruri={sip:+32478720104 at 192.168.68.120:5060}
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:get_hdr_field: <To> [62];
> uri=[sip:+32478720104 at 192.168.68.120:5060]
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:get_hdr_field: to body [sut
> <sip:+32478720104 at 192.168.68.120:5060>]
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:get_hdr_field: cseq <CSeq>: <1> <ACK>
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:get_hdr_field: content_length=0
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:get_hdr_field: found end of header
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:receive_msg: After parse_msg...
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:receive_msg: preparing to run routing scripts...
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:sl:sl_filter_ACK: too late to be a local ACK!
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:comp_scriptvar: int 20: 5062 / 5060
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:comp_scriptvar: int 20: 5062 / 5062
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]: from sipp
> sp==5062==5062, we rewrite to iad listening port 5060 and we forward
> to 185.58.97.161
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_to_param: tag=1
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_to_param: end of header reached, state=11
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:_parse_to: end of header reached, state=29
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:_parse_to: display={sipp}, ruri={sip:sipp at 192.168.68.120:5062}
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:uac:w_replace_from: dsp=0x7ffe38fec2d8 (len=0) ,
> uri=0x7ffe38fec2f0 (len=41)
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> ERROR:uac:replace_uri: decline FROM/TO replacing in sequential request
> in auto mode (has TO tag)
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> ERROR:uac:replace_uri: decline FROM/TO replacing in sequential request
> in auto mode (has TO tag)
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:MD5StringArray: MD5 calculated: 100352e3496e8c8bc067bbd48b3fff67
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_headers: flags=60
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:parse_headers: flags=ffffffffffffffff
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:forward_request: sending:#012ACK
> sip:+32478720104 at x.y.z.t:*5060*;transport=udp;alias=x.y.z.t~11000~1 SIP>
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:forward_request: orig. len=419, new_len=510, proto=1
> Sep 12 10:45:38 sipp /data/opensips/sbin/opensips[1684]:
> DBG:core:destroy_avp_list: destroying list 0x7f9d4b464ae8
>
>
> On 12/09/2022 16:24, johan wrote:
>> Hi,
>>
>> setup : opensips acts as a client of a remote server (i.e. opensips
>> registers itself towards a provider) and handles the OPTIONS being
>> sent.   On the same pc I have a sipp instance that generates traffic.
>>
>> hence
>>
>>
>> provider <- udp 5060 -> opensips <-udp 5062-> sipp
>>
>>
>> The issue is now that the provider changes the contact in 200 ok.
>>
>> Hence in sipp I take the contact from the received 200 and then I put in
>> the request uri of the ACK.
>>
>> the problem si opensips rewrites the contact.
>>
>> How can I avoid that ?
>>
>>
>> route{
>>     # ASYNC PROCESSING => opensips handles it
>>     if (is_method("OPTIONS|NOTIFY|SUBSCRIBE")) {
>>         send_reply(200,"OK");
>>         drop();
>>     }
>>     
>>     if ($sp==IADPORT)   
>>     {
>>         xlog("from iad sp==$sp==IADPORT, we rewrite to sipp listening
>> port SIPPPORT and we forward to SIPPIP");
>>         sethostport("SIPPIP:SIPPPORT");
>>         forward("SIPPIP:SIPPPORT");
>>        
>>     }
>>     else if ($sp==SIPPPORT)
>>     {
>>         xlog("from sipp sp==$sp==SIPPPORT, we rewrite to iad listening
>> port IADPORT and we forward to IADIP");
>>         sethostport("IADIP:IADPORT");
>>         forward("IADIP:IADPORT");
>>     }
>>     else
>>     {
>>         xlog("sp==$sp!=[IADPORT,SIPPPORT], we drop the packet");
>>         drop();
>>     }
>> }
>>
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