[Freeswitch-users] RFC 3263 and failing over

[Joshua Gigg]

I've setup some SRV records to test failover between a few servers.

$ dig _sip._udp.testing-sip.giggsey.net SRV

;; ANSWER SECTION:
_sip._udp.testing-sip.giggsey.net. 371 IN SRV   10 0 5060
testing-sip-real.giggsey.net.
_sip._udp.testing-sip.giggsey.net. 371 IN SRV   0 0 5080
testing-sip-fake.giggsey.net.


testing-sip-fake is a FreeSWITCH box, configured to hangup every inbound
call with 503: NETWORK_OUT_OF_ORDER.

testing-sip-real will accept traffic from this server, and actually connect
to something.

When I make a call via FreeSWITCH (latest master), it sends the INVITE to
testing-sip-fake, which responds correctly. FreeSWITCH does not ACK the
503, but sends the INVITE to testing-sip-real.

testing-sip-real responds with a 200, but FreeSWITCH sends the ACK to
testing-sip-fake.

Trace from sngrep below (apologies for any formatting issues):
http://i.imgur.com/aGOBHpp.png


               │
            193.104.89.40:5080            178.62.61.192:5080
193.104.89.57:5060 │
          ──────────┬─────────          ──────────┬─────────
 ──────────┬───────── │
▒ 17:06:29.054095   │        INVITE (SDP)         │
    │          │
▒       +0.016957   │ ──────────────────────────> │
    │          │
▒ 17:06:29.071052   │         100 Trying          │
    │          │
▒       +0.004131   │ <────────────────────────── │
    │          │
▒ 17:06:29.075183   │   503 Service Unavailable   │
    │          │
▒       +0.005387   │ <────────────────────────── │
    │          │
▒ 17:06:29.080570   │                       INVITE (SDP)
     │          │
▒       +0.003829   │
────────────────────────────────────────────────────────> │          │
▒ 17:06:29.084399   │                     100 Giving a try
     │          │
▒       +0.491453   │
<──────────────────────────────────────────────────────── │          │
▒ 17:06:29.575852   │   503 Service Unavailable   │
    │          │
▒       +1.000255   │ <────────────────────────── │
    │          │
▒ 17:06:30.576107   │   503 Service Unavailable   │
    │          │
▒       +2.000364   │ <<<──────────────────────── │
    │          │
▒ 17:06:32.576471   │   503 Service Unavailable   │
    │          │
▒       +2.662937   │ <<<──────────────────────── │
    │          │
▒ 17:06:35.239408   │                 183 Session Progress (SDP)
     │          │
▒       +1.155243   │
<──────────────────────────────────────────────────────── │          │
▒ 17:06:36.394651   │                 183 Session Progress (SDP)
     │          │
▒       +0.093683   │
<<<────────────────────────────────────────────────────── │          │
▒ 17:06:36.488334   │                     180 Ringing (SDP)
    │          │
▒       +0.088306   │
<──────────────────────────────────────────────────────── │          │
▒ 17:06:36.576640   │   503 Service Unavailable   │
    │          │
▒       +1.936790   │ <────────────────────────── │
    │          │
▒ 17:06:38.513430   │                       200 OK (SDP)
     │          │
▒       +0.010268   │
<──────────────────────────────────────────────────────── │          │
│ 17:06:38.523698   │             ACK             │
    │          │
│       +0.489731   │ ──────────────────────────> │
    │          │
│ 17:06:39.013429   │                       200 OK (SDP)
     │          │
│       +0.000296   │
<──────────────────────────────────────────────────────── │          │
│ 17:06:39.013725   │             ACK             │
    │          │
│       +0.999795   │ ──────────────────────────> │
    │          │
│ 17:06:40.013520   │                       200 OK (SDP)
     │          │
│       +0.000282   │
<──────────────────────────────────────────────────────── │          │
│ 17:06:40.013802   │             ACK             │
    │          │
│       +0.562804   │ ──────────────────────────> │
    │          │
│ 17:06:40.576606   │   503 Service Unavailable   │
    │          │
│       +1.436391   │ <────────────────────────── │
    │          │
│ 17:06:42.012997   │                       200 OK (SDP)
     │          │
│       +0.000149   │
<──────────────────────────────────────────────────────── │          │
│ 17:06:42.013146   │             ACK             │
    │          │
│       +2.564912   │ ──────────────────────────> │
    │          │
│ 17:06:44.578058   │   503 Service Unavailable   │
    │          │
│       +0.685651   │ <────────────────────────── │
    │          │
│ 17:06:45.263709   │             BYE             │
    │          │
│       +0.016618   │ ──────────────────────────> │
    │          │
│ 17:06:45.280327   │   481 Call Does Not Exist   │
    │          │
│       +0.730549   │ <────────────────────────── │
    │          │

               │

Any ideas on where to start to debug?

-- 
Joshua Gigg
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