Dialplan and DIALSTATUS clarification

Asterisk Asterisk Dialplan
1

Hello everyone.
given the following test dialplan, if two users are on the phone, and a third user calls, it always rings free. If say user A and user B are on the phone, and user C calls user A asterisk should tell me that it is busy immediately. Am I wrong?

[from-internal]
exten => _5XX,s,Set(NEWEXTEN=+3905773755${EXTEN:1})
exten => _5XX,n,GoTo(dial-direct)
exten => _X.,s,GoTo(invalid-number)

exten => _X.,n(dial-direct),Dial(PJSIP/${NEWEXTEN})
exten => _X.,n,NoOp(DIALSTATUS: ${DIALSTATUS})
exten => _X.,n,Goto(s-${DIALSTATUS},1)
exten => _X.,n,Hangup()

exten => _X.,n(invalid-number),Playback(invalid)
exten => _X.,n,Hangup()

exten => s-BUSY,1,Playback(busy)
exten => _X.,n,Hangup()

2

The first s should be a 1, otherwise it will use the same priority as the last line for the previous extension.

You haven’t provided details of the destination phone, how that phone is configured, and how the endpoint for the phone is configured, in Asterisk. All of these affect when and/or if a busy condition is detected.

Most SIP phones will allow at least two calls, before the phone, itself, will report busy.