asterisk users - Apr 2007 - pap2 - dtmf works when 'sip debug' is enabled

I am having an odd problem with a linksys pap2 ata and asterisk...
Asterisk won't detect digits from it until I issue a 'sip debug'. As
soon as I turn on sip debugging, everything works perfectly (classic
heisenbug)!

Asterisk is latest Debian 'etch' packaged 1.2.13. sip.conf looks like:

[mc_ext01]
type=friend
secret=ext01
context=mc_ata_in
host=dynamic
dtmfmode=rfc2833
nat=yes
qualify=1000
canreinvite=yes
disallow=all
allow=g729
allow=alaw

the 'dtmf tx method' on the pap2 is set to 'auto'.

Any suggestions?

Thanks

James

> I am having an odd problem with a linksys pap2 ata and asterisk...
> Asterisk won't detect digits from it until I issue a 'sip
debug'. As
> soon as I turn on sip debugging, everything works perfectly (classic
> heisenbug)!
Instead of SIP debug, try capturing the traffic with tcpdump etc. on
the Asterisk server.  If even that is too invasive, connect the PAP2
and a PC to the network via the same dumb hub (or managed switch);
run wireshark on the PC to capture.

If you catch the PAP2 misbehaving, make sure you have the latest
firmware for it.  If no luck, try setting DTMF Tx to AVT.  If still
no luck (and your network speed and jitter permits), perhaps alaw
codec with inband tones will work.

--Stewart