[Users] Proxy Route Processing

[Victor Gamov]

Hi guys!

May be my previous message was some obscure.  I'll try to make it clear.

I have following request comes to my OpenSER (xxx.xxx.xxx.xxx is IP of
this OpenSER):

> PRACK sip:1111 at xxx.xxx.xxx.xxx:5060;nat=yes SIP/2.0
> Via: SIP/2.0/UDP 192.168.100.77:5060;branch=z9hG4bK_00179A52BC45_T59048F1A
> From: "Vit-Horosho" 
> <sip:vit-horosho at xxx.xxx.xxx.xxx>;tag=00179A52BC45_T1304371222
> To: <sip:1111 at xxx.xxx.xxx.xxx:5060>;tag =0015E9A0D47D_T1002915332
> Call-ID: CALL_ID3_00179A52BC45_T2098965184 at 192.168.100.77
> RAck: 1909013112 135588358 INVITE
> CSeq: 135588359 PRACK
> Contact: <sip:vit-horosho at 192.168.100.77:5060>
> Route: <sip:xxx.xxx.xxx.xxx;lr=on;ftag=00179A52BC45_T1304371222>
> Content-Length: 0

this message processed by OpenSER loose_route() and I found following 
output in OpenSER debug:

>  0(99796) parse_headers: flags=200
>  0(99796) is_preloaded: No
>  0(99796) grep_sock_info - checking if host==us: 11==11 && 
> [xxx.xxx.xxx.xxx] == [xxx.xxx.xxx.xxx]
>  0(99796) grep_sock_info - checking if port 5060 matches port 5060
>  0(99796) after_strict: Next hop: 
> 'sip:xxx.xxx.xxx.xxx;lr=on;ftag=00179A52BC45_T1304371222' is loose router
>  0(99796) parse_headers: flags=ffffffffffffffff
>  0(99796) rewrite_uri: Rewriting Request-URI with 
> 'sip:xxx.xxx.xxx;lr=on;ftag=00179A52BC45_T1304371222'
>  0(99796) after_strict: The last route URI: 
> 'sip:xxx.xxx.xxx.xxx;lr=on;ftag=00179A52BC45_T1304371222'
>  0(99796) parse_headers: flags=ffffffffffffffff

It's strange for me why loose_route() change Request-URI with values 
from Route. As I red at RFC3261 "16.12 Summary of Proxy Route 
Processing" part (with my comments):

1. Request-URI must be rewrited based on location service (it will be 
done after loose_route)
2. The proxy will inspect the URI in the topmost Route header
field value. If it indicates this proxy, the proxy removes it
from the Route header field (in my case Route must be removed because it 
indicate this proxy)
3. Proxy will forward the request to the resource indicated
by the URI in the topmost Route header field value (but we have not
this Route after step 2) or in the Request-URI if no Route header
field is present (so it must be forwarded to URI getted on step 1)


So my question:
Is it my misconfiguration and I must call loose_route() not for all
requests coming to my proxy or my misunderstood of RFC3261 ?

(the part of openser.cfg is followed):
 >
 > ----------- cut here ----------------
 >
 >   # we record-route all messages -- to make sure that
 >   # subsequent messages will go through our proxy; that's
 >   # particularly good if upstream and downstream entities
 >   # use different transport protocol
 >   record_route();
 >
 > #xdbg("\n\troute[0]: before loose_route() ou=$ou; ru=$ru\n");
 >   # subsequent messages withing a dialog should take the
 >   # path determined by record-routing
 >   if ( loose_route() ) {
 >     # mark routing logic in request
 >     append_hf("P-hint: rr-enforced\r\n");
 > #    route(1);
 >   };
 >
 >   force_rport();

Thanks for advise!

--
CU,
Victor Gamov