[Asterisk-Users] iax fwd - calling twice

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Hi,
testing a new fwd account, dialling from sip4030 to my FWD number,
sip4021 rings as defined in extensions conf.
Why is this happening twice?

 -- Executing SetCallerID("SIP/4030-a7f2", ""HTCAS"") in new stack
    -- Executing Dial("SIP/4030-a7f2",
"IAX2/617533:xxxxxx at iax2.fwdnet.net/617533|60|r") in new stack
    -- Called 617533:xxxxxx at iax2.fwdnet.net/617533
    -- Call accepted by 65.39.205.121 (format ulaw)
    -- Format for call is ulaw
    -- Accepting AUTHENTICATED call from 65.39.205.121, requested format
= 4, actual format = 4
    -- Executing Dial("IAX2/iaxfwd at 65.39.205.121:4569/3",
"sip/4021|15|r") in new stack
    -- Called 4021
    -- Accepting AUTHENTICATED call from 65.39.205.121, requested format
= 4, actual format = 4
    -- Executing Dial("IAX2/iaxfwd at 65.39.205.121:4569/4",
"sip/4021|15|r") in new stack
    -- Called 4021
    -- IAX2/65.39.205.121:4569/1 is ringing
    -- SIP/4021-c034 is ringing
    -- SIP/4021-717d is ringing
    -- Hungup 'IAX2/65.39.205.121:4569/1'