[OpenSIPS-Users] EC2 and rapidly repeated invites

[Kurtis Heimerl]

Hello mailing list,

I've been working on setting up OpenSIPS on an EC2 instance, routing
traffic between nexmo and our gateway, a FS instance on a public IP. I was
kindly directed to an earlier thread on OpenSIPs and EC2 (
http://lists.opensips.org/pipermail/users/2010-April/012393.html) but have
come to an issue I think is unrelated.

Here's the current architecture:
Nexmo -> EC2 NAT -> OpenSIPs -> EC2 NAT -> FS

I started with a walkthrough on the website (
http://www.unixnews.net/2010/09/dynamic-routing-with-opensips.html) which
roughly seems to be working. I've configured the gateway, the routes, and
so on. When I call my Nexmo number, it successfully routes to FS and rings
but, when answered, never connects, failing after 30 seconds. This is, as
expected, the OK never reaching Nexmo and the RTP negotiation never
starting. I started poking around in wireshark and ran into another issue:
OpenSIPs is forwarding 9 invites in rapid succession (less than a second)
rather than just the one it received! FS *seems* to handle this correctly
(482 Request Merged) but it makes the SIP trace an enormous mess and
completely unreadable.

The opensips log is a mess, but isn't particularly useful:
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]:
ERROR:signaling:sig_send_reply_mod: failed to send reply with tm module
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]:
ERROR:tm:add_uac: maximum number of branches exceeded
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]:
ERROR:tm:t_forward_nonack: failure to add branches
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]:
ERROR:tm:w_t_relay: t_forward_nonack failed
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]:
ERROR:tm:_reply_light: failed to generate 500 reply when a final 500 was
sent out
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]:
ERROR:signaling:sig_send_reply_mod: failed to send reply with tm module
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]: incoming reply
Jun  8 21:55:51 ip-172-31-27-53 /usr/sbin/opensips[18082]: incoming reply
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]:
CRITICAL:core:eval_expr: too many expressions (101)
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]:
WARNING:core:do_action: error in expression (l=272)
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]:
CRITICAL:core:eval_expr: too many expressions (101)
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]:
WARNING:core:do_action: error in expression (l=283)
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]:
CRITICAL:core:eval_expr: too many expressions (101)
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]:
WARNING:core:do_action: error in expression (l=285)
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18082]: new branch at
sip:18178184971 at gadogado.banatao.berkeley.edu
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18083]: message repeated
5 times: [ incoming reply]
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18083]:
CRITICAL:tm:t_should_relay_response: pick_branch failed (lowest==-1) for
code 482
Jun  8 21:56:55 ip-172-31-27-53 /usr/sbin/opensips[18083]: incoming reply

Does anyone have any idea what would cause OpenSIPs to forward an invite 9
times in less than a second? Fixing that should allow me to move onto
figuring out why it's not forwarding the 200 OK back to Nexmo.

Thanks!
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