Simultaneous calls out on specific route

General Help
1

simultaneous calls out on specific route

I saw that you can restrict calls for simultaneous trunk

But if you want to limit outgoing call on a specific route that files you have to touch?

2

in particular:
file /etc/asterisk/extensions_additional.conf
This is my outbound course:

[outrt-1] ; Ufficio
exten => _.,1,Macro(user-callerid,LIMIT,EXTERNAL,)
exten => _.,n,Gosub(sub-record-check,s,1(out,${EXTEN},dontcare))
exten => _.,n,ExecIf($[ “${CALLEE_ACCOUNCODE}” != “” ] ?Set(CDR(accountcode)=${CALLEE_ACCOUNCODE}))
exten => _.,n,Set(MOHCLASS=${IF($["${MOHCLASS}"=""]?default:${MOHCLASS})})
exten => _.,n,Set(_NODEST=)
exten => _.,n,Macro(dialout-trunk,2,${EXTEN},on)
exten => _.*,n,Macro(outisbusy,)

and you can insert a line to prevent more than n simultaneous calls?