[Asterisk-Users] IAX Call not transferred - plz help

[Kannaiyan Natesan]

I have a problem with IAX call transfer. The call goes successful but
consumes lot of BW in the middle tier.
The actual connection is like this

(NAT) DIAX(IAX2) -----> *1 ------> *2

*1 & *2 were public IP with asterisk.

It consumes around 120kbps in total to forward a single GSM call.

I have the following configuration in my iax.conf

[general]
...
disallow=all
allow=gsm

[provider]
type=peer
username=userid
secret=password
host=myprovider.com

i can successfully make a call to my provider through the following settings
in extensions.conf

exten => _X.,1,Dial(IAX2/username at provider/extension|tr)

but the call is still natively bridged. Can you help me how can i avoid
native bridging.


Accepting AUTHENTICATED call from 81.86.88.233, requested format = 2, actual
format = 2
    -- Executing Goto("IAX2[13731 at 13731]/1", "13731|s|1") in new stack
    -- Goto (13731,s,1)
    -- Executing Wait("IAX2[13731 at 13731]/1", "2") in new stack
    -- Executing Answer("IAX2[13731 at 13731]/1", "") in new stack
    -- Executing DigitTimeout("IAX2[13731 at 13731]/1", "3") in new stack
    -- Set Digit Timeout to 3
    -- Executing ResponseTimeout("IAX2[13731 at 13731]/1", "10") in new stack
    -- Set Response Timeout to 10
  == CDR updated on IAX2[13731 at 13731]/1
    -- Executing Dial("IAX2[13731 at 13731]/1",
"IAX2/userid at provider/845745|40|tr") in new stack
    -- Called userid at provider/845745
    -- Call accepted by 69.28.208.84 (format GSM)
    -- Format for call is GSM
    -- IAX2[provider]/4 is ringing
    -- IAX2[provider]/4 stopped sounds
    -- IAX2[provider]/4 answered IAX2[13731 at 13731]/1
    -- Attempting native bridge of IAX2[13731 at 13731]/1 and IAX2[provider]/4
    -- Channel 'IAX2[provider]/4' unable to transfer
    -- Hungup 'IAX2[provider]/4'


Can anyone please help me where could be the problem and how to avoid native
bridging.

Thanks for your help.

Kannaiyan