fax2mail-custom]
exten => s,1,Set(FAXFILE=/var/spool/asterisk/fax/${UNIQUEID}.tif)
exten => s,n,Answer()
exten => s,n,rxfax(${FAXFILE})
exten => s,n,system(/var/lib/asterisk/bin/fax-process.pl --to ${EMAILADDR} --from ${FAX_RX_FROM} --subject "Fax from ${URIENCODE(${CALLERID(number)})} ${URIENCODE(${CALLERID(name)})}" --attachment fax_${URIENCODE(${CALLERID(number)})}.pdf --type application/pdf --file ${FAXFILE});
exten => s,n,Hangup()

[ext-did-custom]
exten => my-nummber,1,Set(EMAILADDR=my-email@my-domain)
exten => my-nummber,n,Goto(fax2mail-custom,s,1)