Fax detected, but no fax extension

hi all
i have stting up a TB 2.2 with a Sangoma A200 card
now all works fine except the fax detection
i need that the faxes are emailed to my email as attachment
in freepbx i have:

General Settings
- Extension of fax machine for receveing fax: system
- Email address to have faxes emailed to: myemail@gmail.com
- Email address that faxes appear to come from: myemail@gmail.com

Inbound Route (Zaptel Channel 1)
Fax Handling
Fax extension: freepbx default
fax email:
fax detection type: zaptel
pause after answer: 3

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tail -f /var/log/asterisk/full

Aug 24 08:12:01 DEBUG[4122] chan_zap.c: Requested indication 3 on channel Zap/1-1
Aug 24 08:12:03 DEBUG[4122] chan_zap.c: Exception on 16, channel 4
Aug 24 08:12:03 DEBUG[4122] chan_zap.c: Got event Ringer Off(11) on channel 4 (index 0)
Aug 24 08:12:07 DEBUG[4122] chan_zap.c: Exception on 16, channel 4
Aug 24 08:12:07 DEBUG[4122] chan_zap.c: Got event Ringer On(10) on channel 4 (index 0)
Aug 24 08:12:09 DEBUG[4122] chan_zap.c: Exception on 16, channel 4
Aug 24 08:12:09 DEBUG[4122] chan_zap.c: Got event Ringer Off(11) on channel 4 (index 0)
Aug 24 08:12:11 DEBUG[4122] chan_zap.c: DTMF digit: f on Zap/1-1
Aug 24 08:12:11 NOTICE[4122] chan_zap.c: Fax detected, but no fax extension
Aug 24 08:12:13 DEBUG[4122] chan_zap.c: Exception on 16, channel 4
Aug 24 08:12:13 DEBUG[4122] chan_zap.c: Got event Ringer On(10) on channel 4 (index 0)
Aug 24 08:12:15 DEBUG[4122] chan_zap.c: Exception on 16, channel 4
Aug 24 08:12:15 DEBUG[4122] chan_zap.c: Got event Ringer Off(11) on channel 4 (index 0)
Aug 24 08:12:15 DEBUG[4122] chan_zap.c: DTMF digit: f on Zap/1-1
Aug 24 08:12:15 DEBUG[4122] chan_zap.c: Fax already handled

=============================================================

i think that the problem is
Aug 24 08:12:11 NOTICE[4122] chan_zap.c: Fax detected, but no fax extension

any idea?