Can't get siproxd to work

I'm trying to get siproxd to work as a proxy between a Mitel 5055 phone
on a private network and an Asterisk server on the Internet.  Here is
my test setup:

+-----------------------+
| 5055 Phone, ext. 1000 |
+-----------------------+
  |.9
  |192.168.90.0/24 (private network)
  |
  |.1
+-------------------+
| Gateway (siproxd) |
+-------------------+
  |.5
  |
  |205.233.218.0/25     .14+-----------------------+
  +------------------------| 5055 Phone, ext. 1002 |
  |                        +-----------------------+
  |.10
+----------+
| Asterisk |
+----------+

Ext. 1000 registers with siproxd and uses siproxd as a proxy.  Siproxd
in turn uses Asterisk as a proxy.

When I dial 1002 from ext. 1000, ext. 1002 rings.  When I answer, no
connection is made, and ext. 1002 rings again a few seconds later.

tcpdump on the internal network shows only packets from ext. 1000, none
from siproxd, e.g.

12:14:45.688449 192.168.90.9.5060 > 192.168.90.1.5060: udp 704
12:14:46.237597 192.168.90.9.5060 > 192.168.90.1.5060: udp 704
12:14:47.287526 192.168.90.9.5060 > 192.168.90.1.5060: udp 704
12:14:49.337487 192.168.90.9.5060 > 192.168.90.1.5060: udp 704
12:14:53.387489 192.168.90.9.5060 > 192.168.90.1.5060: udp 704
12:14:57.257638 192.168.90.9.5060 > 192.168.90.1.5060: udp 365
12:14:57.807521 192.168.90.9.5060 > 192.168.90.1.5060: udp 365
12:14:58.864287 192.168.90.9.5060 > 192.168.90.1.5060: udp 365
12:15:00.922289 192.168.90.9.5060 > 192.168.90.1.5060: udp 365

tcpdump on the external network from the gateway shows a fair amount
of traffic between Asterisk and the gateway, e.g.

12:53:08.096222 205.233.218.5.5060 > 205.233.218.10.5060: udp 809 (DF)
12:53:08.096433 205.233.218.10.5060 > 205.233.218.5.5060: udp 442 (DF)
12:53:08.080950 205.233.218.10.5060 > 205.233.218.5.5060: udp 443 (DF)
12:53:08.627450 205.233.218.5.5060 > 205.233.218.10.5060: udp 809 (DF)
12:53:08.627955 205.233.218.10.5060 > 205.233.218.5.5060: udp 442 (DF)
12:53:09.685765 205.233.218.5.5060 > 205.233.218.10.5060: udp 809 (DF)
12:53:09.686264 205.233.218.10.5060 > 205.233.218.5.5060: udp 442 (DF)
12:53:09.857811 205.233.218.10.5060 > 205.233.218.5.5060: udp 715 (DF)
12:53:10.365812 205.233.218.10.15838 > 205.233.218.5.7070: udp 172 (DF)
[...]
12:53:15.845776 205.233.218.10.15838 > 205.233.218.5.7070: udp 172 (DF)
12:53:15.863486 205.233.218.5.5060 > 205.233.218.10.5060: udp 809 (DF)
12:53:15.864133 205.233.218.10.5060 > 205.233.218.5.5060: udp 715 (DF)

(traffic between Asterix and ext. 1002 is not shown because this is a
switched network)

tcpdump on Asterisk shows that ext. 1002 is responding:

13:05:15.661738 IP 205.233.218.5.5060 > 205.233.218.10.5060: UDP, length 809
13:05:15.662196 IP 205.233.218.10.5060 > 205.233.218.5.5060: UDP, length 442
13:05:15.662877 IP 205.233.218.10.5060 > 205.233.218.14.5060: UDP, length 749
13:05:15.663012 IP 205.233.218.10.5060 > 205.233.218.5.5060: UDP, length 443
13:05:15.735000 IP 205.233.218.14.5060 > 205.233.218.10.5060: UDP, length 353
13:05:15.736693 IP 205.233.218.14.5060 > 205.233.218.10.5060: UDP, length 354
13:05:16.204154 IP 205.233.218.5.5060 > 205.233.218.10.5060: UDP, length 809
13:05:16.204206 IP 205.233.218.10.5060 > 205.233.218.5.5060: UDP, length 442
13:05:17.255575 IP 205.233.218.5.5060 > 205.233.218.10.5060: UDP, length 809
13:05:17.255674 IP 205.233.218.10.5060 > 205.233.218.5.5060: UDP, length 442
13:05:19.055489 IP 205.233.218.14.5060 > 205.233.218.10.5060: UDP, length 703
13:05:19.055655 IP 205.233.218.10.5060 > 205.233.218.14.5060: UDP, length 383
13:05:19.055873 IP 205.233.218.10.5060 > 205.233.218.5.5060: UDP, length 715
13:05:19.128410 IP 205.233.218.14.20056 > 205.233.218.10.18332: UDP, length 172
[...]

So the problem really seems to be siproxd not relaying the connection
back to ext. 1000.

I have uploaded a log of one call attempt with full debugging to
http://modernduck.com/temp/siproxd.debug.1 .  Relevant times:
13:03:25: dialed 1002 from 1000
13:03:27: Answer from 1002
13:03:34: 1002 shows the call as dropped
13:03:36: hangup on 1000

My configuration is at http://modernduck.com/temp/siproxd.conf .

Any suggestions on things to try?

Thanks,
Jody


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