asterisk users - Apr 2004 - FWD <> SIP <> Asterisk <> IAX <> Firefly

Hello,

In my sip.conf I have:

;Register and forward FWD numbers to internal extensions

register => FWDNUMBER:PASSWORD@fwd.pulver.com/9500

Which should register Asterisk at FWD and then when any calls are made to
FWDNUMBER those calls should be forwarded to extension 9500 as specified in
the extensions.conf.

What I am getting is it is trying to dial the 9500 (IAX Firefly) client
twice when a call is made to FWDNUMBER.  The output from the CLI from
Asterisk is this:

-- Registered '9500' (AUTHENTICATED) at 10.10.20.5:4569
    -- Executing Macro("SIP/-080fbd10", "stdExt|IAX2|9500")
in new stack
    -- Executing Dial("SIP/-080fbd10", "IAX2/9500|15") in
new stack
    -- Called 9500
    -- Call accepted by 10.10.20.5 (format GSM)
    -- Format for call is GSM
    -- IAX2[9500]/3 is ringing
    -- Executing Macro("SIP/-0814f210", "stdExt|IAX2|9500")
in new stack
    -- Executing Dial("SIP/-0814f210", "IAX2/9500|15") in
new stack
    -- Called 9500
Apr 21 11:14:37 WARNING[1158883648]: chan_iax2.c:4898 socket_read: Call
rejected by 10.10.20.5: In call
    -- Hungup 'IAX2[9500]/4'
  == No one is available to answer at this time
    -- Executing VoiceMail("SIP/-0814f210", "u9500") in new
stack
    -- Playing 'vm-theperson' (language 'en')
    -- Hungup 'IAX2[9500]/3'
  == Spawn extension (macro-stdExt, s, 1) exited non-zero on
'SIP/-080fbd10'
in macro 'stdExt'
  == Spawn extension (default, 9500, 1) exited non-zero on
'SIP/-080fbd10'
    -- Playing 'digits/9' (language 'en')
    -- Playing 'digits/5' (language 'en')
    -- Playing 'digits/0' (language 'en')
    -- Playing 'digits/0' (language 'en')
    -- Playing 'vm-isunavail' (language 'en')
    -- Playing 'vm-intro' (language 'en')
    -- Playing 'beep' (language 'en')
Apr 21 11:14:49 WARNING[1142106688]: chan_sip.c:497 retrans_pkt: Maximum
retries exceeded on call 56da75f25ec
25c777d2ad4dd52ebd0e1@65.39.205.121 for seqno 104 (Response)
  == Spawn extension (macro-stdExt, s, 2) exited non-zero on
'SIP/-0814f210'
in macro 'stdExt'
  == Spawn extension (default, 9500, 1) exited non-zero on
'SIP/-0814f210'

Does anyone know why it is doing this?  Have any suggestions?  It worked
yesterday well and then today I have been getting the above where when it
dials the second time it goes to voicemail because the 9500 extension is
"in
use".

Thanks for the help!

Darrin