asterisk users - Mar 2005 - Hang on "making progrogress passing" when dialing out

I am getting the following on dial-out via Sipphone to a 1-800 number
(numbers obscured):
-------------------------------------------------
  == Spawn extension (macro-sipphone, s, 3) exited non-zero on
'SIP/eric-9546' in macro 'sipphone'
  == Spawn extension (default, 1747xxxxxxx, 1) exited non-zero on
'SIP/eric-9546'
    -- Executing Macro("SIP/eric-8e80",
"sipphone|1800xxxxxxx") in new
stack
    -- Executing SetCallerID("SIP/eric-8e80", "1747xxxxxxx")
in new
stack
    -- Executing SetCIDName("SIP/eric-8e80", ""Eric
Windisch"") in new
stack
    -- Executing Dial("SIP/eric-8e80",
"SIP/1800xxxxxxx@proxy01.sipphone.com||r") in new stack
    -- Called 18002877863@proxy01.sipphone.com
    -- SIP/proxy01.sipphone.com-8361 is making progress passing it to
SIP/eric-8e80
  == Spawn extension (macro-sipphone, s, 3) exited non-zero on
'SIP/eric-8e80' in macro 'sipphone'
  == Spawn extension (default, 1800xxxxxxx, 1) exited non-zero on
'SIP/eric-8e80'
-------------------------------------------------

System details:
* I do not have any G729 licenses
* The system is behind a two NAT routers with ports 5060 and 5061
forwarded on each.
* externip and localnet are defined in sip.conf.
* There is no special codec configuration in sip.conf (defaults)
* SIP/eric is a Sipura 2100 with Preferred Codec = G711u, and Use
Preferred Coded Only = no.
* I am able to successfully make and receive calls through Zap/1, just
not to sipphone.

-- 
Eric Windisch <lists@bwbohh.net>