[Asterisk-Users] IAX channel unable to create

[kurt x]

I have two * boxes running two differnet versions of *. 
 Box A is running:

Asterisk CVS-HEAD-07/14/04-16:28:29 built by
root at asterick.dell.cpu.com on a i686 running Linux

Box B is running:

Asterisk 1.0.3 built by root at dell.cpu.net on a i386 running FreeBSD

I can make a IAX call from B to A but not from A to B.
When I try to make a call from A to B I get these messages:

Feb 21 12:48:12 WARNING[-1233155152]: channel.c:1860 ast_request: No
channel type registered for 'IAX'
Feb 21 12:48:12 NOTICE[-1233155152]: app_dial.c:696 dial_exec: Unable
to create channel of type 'IAX'
Feb 21 12:48:14 WARNING[-1116300368]: chan_sip.c:673 retrans_pkt:
Maximum retries exceeded on call
MGC12320050221124808578324-68802635083-54444D000001F742219B33421A1ED866 at 192.168.1
for seqno 1 (Non-critical Response)

My box A iax.conf:
[general]
port=5036
bindport=5036
bandwidth=low
allow=ulaw                      
disallow=lpc10                  
jitterbuffer=no
tos=lowdelay

[slave]
type=friend
secret=4435
context=voice-mail
defaultip=192.168.2.232
qualify=yes

My Box A extension.conf
[voice-mail]
exten => _2000,1,Dial(IAX/master:4435 at 192.168.2.232/2000 at home)

My box B iax.conf
[general]
port=5036
bindport=5036
bandwidth=low
allow=ulaw                     
disallow=lpc10                 
tos=lowdelay

[master]
type=friend
secret=4435
context=home
defaultip=192.168.1.2
qualify=yes

My Box B extension.conf
[home]
exten => _24xx,1,Dial(IAX2/slave:4435 at 192.168.1.2/${EXTEN}@voice-mail)

Thanks in advance

Kurt