[iaxmodem-users] IAXmodem seems to work, but no carrier

[Chris O. <Chris.Ott@AskAllegiance.com>]

I'm using Asterisk to provide a SIP trunk for IAXmodem. (Asterisk and IAXmodem are running on the same machine.) I start IAXmodem (in the foreground) with:

    iaxmodem ttyIAX0

Then, I connect to ttyIAX0, using "minicom". When I call the IAXmodem extension (from a regular phone), I get a "RING" from IAXmodem, at which point I type "ATA", to tell IAXmodem to answer the call. At that point, I can hear (in my phone) that it has stopped ringing, but I never get a carrier from IAXmodem. Finally, I hang up my phone and IAXmodem disconnects immediately, saying "NO CARRIER".

Using Wireshark, I can tell that IAXmodem is sending what look like audio packets, but all the "Data" bytes are 0xff - even on the "IAX2" port, between IAXmodem and Asterisk.

Here's my /etc/iaxmodem/ttyIAX0:

    device /dev/ttyIAX0
    owner uucp:uucp
    mode 660
    port 4570
    refresh 300
    server 127.0.0.1
    peername 1600
    secret xxxxxxx
    codec ulaw
    dspdebug
    iax2debug

How would I go about finding the problem, here?

Thanks