in extension.conf

[default]
exten => fax,1,Goto(fax-in,s,1)

[fax-in]
exten => s,1,Set(FAXFILE=/var/spool/astersik/fax/i${CALLERIDNUM}-${TIMESTAMP}.tif)
exten => s,2,rxfax(${FAXFILE})
exten => t,1,hangup
include => default

in zapata.conf

context=default
faxdetect=incoming


and i get this errors

    -- Starting simple switch on 'Zap/2-1'
Aug 10 12:02:54 NOTICE[18906]: chan_zap.c:6057 ss_thread: Got event 18 (Ring Begin)...
Aug 10 12:02:55 NOTICE[18906]: chan_zap.c:6057 ss_thread: Got event 2 (Ring/Answered)...
  == Starting Zap/2-1 at default,s,1 failed so falling back to exten 's'
  == Starting Zap/2-1 at default,s,1 still failed so falling back to context 'default'
Aug 10 12:02:55 WARNING[18906]: pbx.c:2357 __ast_pbx_run: Channel 'Zap/2-1' sent into invalid extension 's' in context 'default', but no invalid handler
    -- Hungup 'Zap/2-1'