Hi Michael,
Yes, if it would help you, you can remove the + and add 00 like this:
[cid-cleanup]
exten => _.,1,noop(entering user defined context [cid-cleanup] in extensions_custom.conf)
exten => _.,n,noop(Received CID number: ${CALLERID(number)})
exten => _.,n,set(CALLERID(number)=${CUT(CALLERID(number),\;,1)})
exten => _.,n,noop(Proceeding with CID number: ${CALLERID(number)})
exten => _.,n,goto(from-trunk,00${EXTEN:1},1)
Thank you,
Daniel Friedman
Trixton LTD.