[Users] 200-OK and sendto() problem

[Andreas Granig]

Hi,

I'm going crazy with this problem, so maybe anyone here can see any 
error or can give a hint how to debug this.

I've two clients behind (the same) NAT. INVITE goes thru, so does 100 
and 180. But the 200 isn't relayed because of the following syslog error:

./sbin/openser[23933]: ERROR: udp_send: 
sendto(sock,0x81816a8,814,0,0xb5b7f168,16): Operation not permitted(1)
./sbin/openser[23933]: msg_send: ERROR: udp_send failed

I can't find any error (the two Via headers are exactly the same), so 
here is the 180 which is relayed without problems, and below the 200, 
which causes the error:

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 84.19.176.11;branch=z9hG4bK6351.1b30ad43.0
Via: SIP/2.0/UDP 
192.168.123.100:2083;received=83.65.24.161;branch=z9hG4bK-kq6qyyeowiei;rport=12499
From: "Foo Bar" <sip:foo1000 at linguin.org>;tag=xuu6a2tp6b
To: <sip:2000 at linguin.org;user=phone>;tag=2091138726
Call-ID: 3c27e5729c40-csdi3p954zyn at snom360-0004132306CE
CSeq: 2 INVITE
Server: Cisco ATA 186  v3.1.1 atasip (040629A)
Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER
Content-Length: 0



SIP/2.0 200 OK
Via: SIP/2.0/UDP 84.19.176.11;branch=z9hG4bK6351.1b30ad43.0
Via: SIP/2.0/UDP 
192.168.123.100:2083;received=83.65.24.161;branch=z9hG4bK-kq6qyyeowiei;rport=12499
Record-Route: <sip:84.19.176.11;lr=on;ftag=xuu6a2tp6b;nat=yes>
From: "Foo Bar" <sip:foo1000 at linguin.org>;tag=xuu6a2tp6b
To: <sip:2000 at linguin.org;user=phone>;tag=2091138726
Call-ID: 3c27e5729c40-csdi3p954zyn at snom360-0004132306CE
CSeq: 2 INVITE
Contact: <sip:foo2000 at 192.168.123.103:5060;transport=udp>
Server: Cisco ATA 186  v3.1.1 atasip (040629A)
Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER
Supported: replaces
Content-Length: 204
Content-Type: application/sdp

v=0
o=foo2000 11828 11828 IN IP4 192.168.123.103
s=ATA186 Call
c=IN IP4 192.168.123.103
t=0 0
m=audio 16384 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000/1
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

Any ideas?

Regards,
Andreas

PS: this happens with both OpenSER 1.1 and 1.2