[OpenSIPS-Users] Delay in relaying SIP message to UA

[Julian Yap]

I'm having a problem where is looks like there is a delay in OpenSIPS
relaying a SIP packet back to the originating UA.

Here is a stripped Ngrep trace which shows the time stamps.

In the example:
9.9.9.101 = IP of the Calling UA
8.8.8.41 = IP of the Proxy
9.9.9.15 = IP of the Called UA

The 180 Ringing is received by the Proxy at 16:00:58.628464 but is
only relayed on at 16:00:58.918988.

Trace:

U 2010/07/13 16:00:58.560395 9.9.9.101:10673 -> 8.8.8.41:5060
INVITE sip:5551234 at my.proxy.com;user=phone SIP/2.0.
--
U 2010/07/13 16:00:58.560599 8.8.8.41:5060 -> 9.9.9.101:10673
SIP/2.0 100 Trying.
--
U 2010/07/13 16:00:58.560658 8.8.8.41:5060 -> 9.9.9.101:10673
SIP/2.0 407 Proxy Authentication Required.
--
U 2010/07/13 16:00:58.588648 9.9.9.101:10673 -> 8.8.8.41:5060
ACK sip:5551234 at my.proxy.com SIP/2.0.
--
U 2010/07/13 16:00:58.592480 9.9.9.101:10673 -> 8.8.8.41:5060
INVITE sip:5551234 at my.proxy.com;user=phone SIP/2.0.
--
U 2010/07/13 16:00:58.592592 8.8.8.41:5060 -> 9.9.9.101:10673
SIP/2.0 100 Trying.
--
U 2010/07/13 16:00:58.594010 8.8.8.41:5060 -> 9.9.9.15:5060
INVITE sip:+18085551234 at 9.9.9.15 SIP/2.0.
--
U 2010/07/13 16:00:58.598573 9.9.9.15:5060 -> 8.8.8.41:5060
SIP/2.0 100 Trying.
--
U 2010/07/13 16:00:58.628464 9.9.9.15:5060 -> 8.8.8.41:5060
SIP/2.0 180 Ringing.
--
U 2010/07/13 16:00:58.628780 9.9.9.15:5060 -> 8.8.8.41:5060
SIP/2.0 200 OK.
--
U 2010/07/13 16:00:58.918988 8.8.8.41:5060 -> 9.9.9.101:10673
SIP/2.0 180 Ringing.