How to properly handle Asterisk line status?

Question

Asterisk

Good day! In Asterisk, I'm newbie, please don't swear too much. Already been on google.
The point is this. There are 2 automatic telephone exchanges
1 aster on it the majority of users turns.
2 BIT.PBX to which external calls are directed.
Before connecting with BIT.ATS, if the destination phone is busy, disconnected, etc., the master spoke the appropriate phrases, now not, apparently I broke the dialplan for this case. Please help
[call-out]
;Applications
;Calling an extension
;Enable recording
exten => _5XXX,1,Dial(SIP/${EXTEN}@bit)
exten => _XXX,1,Macro(recording,${CALLERID( num)},${EXTEN})
;GROUPS
exten => 456,1,Dial(SIP/319&SIP/320&SIP/321,,m(default))
exten => 457,1,Dial(SIP/137&SIP/138&SIP/139 ,,m(default))
exten => 603,1,Dial(SIP/[email protected])
exten => 458,1,Dial(SIP/${EXTEN}@bit)
exten => _XXX,n,Dial(SIP/${EXTEN},15 )
exten => _XXXX,n,Dial(SIP/${EXTEN},15)
exten => _XXX,n,Set(dstNUM=${EXTEN})
;Check peer status, exists or not
exten => _XXX,n, GotoIf($["${SIPPEER(${EXTEN},status)}" = ""]?num-not-exist,1)
;Check peer status, connected or not
exten => _XXX,n,GotoIf($[ "${SIPPEER(${EXTEN},status):0:2}" = "UN"]?num-not-connected,1)
;Check if the channel is busy
exten => _XXX,n,ChanIsAvail(SIP/${ EXTEN},s)
;Output the value of the ChanIsAvail function to the log, only needed for debugging, you can delete the line
exten => _XXX,n,Verbose(=========== ChanIsAvail STATUS: ${AVAILSTATUS} ===========)
;If the function returns 2 or 3, then the subscriber is busy
exten => _XXX,n,GoToIf($[${AVAILSTATUS} = 2]?num-BUSY,1)
exten => _XXX,n,GoToIf($[${AVAILSTATUS } = 3]?num-BUSY,1)
exten => _XXX,n,GoToIf($[${AVAILSTATUS} = 6]?num-BUSY,1)
;Process other statuses
exten => _XXX,n,Goto(num -${DIALSTATUS},1)
;If the number doesn't exist, say "Wrong number, try again"
exten => num-not-exist,1,Wait(2)
exten => num-not-exist,n,Playback( invalid)
; If the number is not connected, say "The number you dialed is disconnected, check the number and try again
exten => num-not-connected,1,Wait(2)
exten => num-not-connected,n,Playback(ss- noservice)
; If the number is busy, say "Busy"
exten => num-BUSY,1,Wait(2)
exten => num-BUSY,n,Playback(vm-isonphone)
;If for some reason the status is CHANUNAVAIL, we say that the number is not available at the moment
exten => num-CHANUNAVAIL,1,Wait(2)
exten => num-CHANUNAVAIL,n,Playback(vm-isunavail)
;If for some reason the CHANUNAVAIL status is still there, we say that the number is not available at the moment
exten = > num-UNKNOWN,1,Wait(2)
exten => num-UNKNOWN,n,Playback(vm-isunavail)

Answer 1

Solution in the comments