[OpenSIPS-Users] Opensips do not route ACK to Asterisk

[aleks]

Dear all, 

i'm having scenario where opensips 1.6.3 and asterisk is on the same host
behind nat and in DMZ. Opensips binds on port 5060 and asterisk on 5061. 

Rtp proxy for nat traversal also running on same machine started and
opensips do not report any errors.   ( started like  rtpproxy -l
public_ip_opensips_and* -s udp:127.0.0.1:7890 -F -u rtpproxy). RTP proxy use
default udp range 350000-65534 and asterisk use 10000-35000 range. 



UA is X-lite and behind nat. 
Calls are getting connected but they drop after 30 sec. X-lite recive 200 ok
from * and sends back ACK. But ACK not getting to Asterisk. Asterisk reports
retransmit timeout error.   

I'm think that problem is like they say in sip-retransmit file 

- A SIP middlebox (SBC) that rewrites contact: headers 
  so that we can't reach the other side with our reply 
  or the ACK. 
- A badly configured SIP proxy that forgets to add 
  record-route headers to make sure that signalling works. 

When X-lite is in lan where is opensips error do not exists.

Here is 200 ok that asterisk keep retransmiting: 

^[[0KRetransmitting #2 (no NAT) to 192.168.1.42:5060: 
SIP/2.0 200 OK 
v: SIP/2.0/UDP
192.168.1.42;branch=z9hG4bKe31e.f8aa9df6.0;received=192.168.1.42 
v: SIP/2.0/UDP
PUBLIC_IP_OF_UA:59788;rport=59788;received=PUBLIC_IP_OF_UA;branch=z9hG4bK-d8754z-c754d54c1f044c74-1---d8754z- 
Record-Route: <sip:192.168.1.42;lr=on> 
f: "tommy2" <sip:6557181066 at PUBLIC_IP_OF_OPENSIPS_AND*>;tag=740b0d14 
t: "7890100" <sip:7890100 at 8PUBLIC_IP_OF_OPENSIPS_AND*>;tag=as57556733 
i: YjNjZThlNjljMjk2ODE5MmU1NDNiNTJhMTY5ZDg2MWQ. 
CSeq: 2 INVITE 
Server: Asterisk PBX 
^[[0Kllow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY,
INFO, PUBLISH 
k: replaces, timer 
m: <sip:7890100 at 192.168.1.42:5061> 
c: application/sdp 
l: 261 
In opensips.cfg file i have this 2 section that involves ACK: 

if ( is_method("ACK") ) { 
                                

                                        if ( t_check_trans() ) { 
                                        # non loose-route, but stateful ACK;
must be an ACK after 
                                        # a 487 or e.g. 404 from upstream
server 
                                        t_relay(); 
                                        exit; 
                                } else { 
                                        # ACK without matching transaction
-> 
                                        # ignore and discard 
                                        exit; 
                                } 
                        } 
                        sl_send_reply("404","Not here"); 
                } 
                exit; 
        } 

and : 


# preloaded route checking 
        if (loose_route()) { 
                xlog("L_ERR", 
                "Attempt to route with preloaded Route's
[$fu/$tu/$ru/$ci]"); 
                if (!is_method("ACK")) 
                        sl_send_reply("403","Preload Route denied"); 
                append_hf("P-hint: rr-enforced\r\n"); 
                route(1); 
        } 


i'm sending calls this way : 

  
route[4] { 
  #---- PSTN route ----# 
  rewritehostport("192.168.1.42:5061"); 
        route(1); 
        exit; 
} 

Opensips log reports 

Nov 20 16:38:16 localhost /sbin/opensips[30143]: DBG:core:parse_headers:
flags=ffffffffffffffff
Nov 20 16:38:16 localhost /sbin/opensips[30143]: DBG:core:check_ip_address:
params PUBLIC_IP_XLITE,PUBLIC_IP_XLITE , 0
Nov 20 16:38:16 localhost /sbin/opensips[30143]: DBG:core:destroy_avp_list:
destroying list (nil)
Nov 20 16:38:16 localhost /sbin/opensips[30143]: DBG:core:receive_msg:
cleaning up
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_msg: SIP
Request:
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_msg: 
method:  <ACK>
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_msg:  uri:    
<sip:007890100 at PUB_IP_OPENSIPS>
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_msg: 
version: <SIP/2.0>
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_headers:
flags=2
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_via_param:
found param type 232, <branch> = <z9hG4bK-9364702f>; state=16
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_via: end of
header reached, state=5
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_headers: via
found, flags=2
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_headers:
this is the first via
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:receive_msg: After
parse_msg...
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:receive_msg:
preparing to run routing scripts...
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_headers:
flags=8
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_to_param:
tag=a7848d58f55defae860d8b40a448cabf.2507
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_to: end of
header reached, state=29
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:parse_to:
display={}, ruri={sip:007890100 at PUB_IP_OPENSIPS}
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:get_hdr_field:
<To> [73]; uri=[sip:007890100 at PUB_IP_OPENSIPS]
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:get_hdr_field: to
body [<sip:007890100 at PUB_IP_OPENSIPS200@>]
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:sl:sl_filter_ACK: local
ACK found -> dropping it!
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:destroy_avp_list:
destroying list (nil)
Nov 20 16:38:16 localhost /sbin/opensips[30146]: DBG:core:receive_msg:
cleaning up

Is opensips dropping ACK ? How to fix this? TY!!! 


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