How to forward a call if one of the two subscribers is busy?

Question

Asterisk

Good afternoon!
For several days now I can not solve the problem of how to forward a call if one of the two subscribers is busy.
There is a call: It is
exten => s,1,Dial(DAHDI/g1/100&DAHDI/g1/101)
necessary to make it so that if at least one of these numbers is busy, the call goes to another context / extension.
I don't know how to solve. Please help!

Answer 1

Pre-check busy lines via ChanIsAvail()

Answer 2

Follow me - no?
And it didn’t take long to turn everything with handles for standard procedures, why not use the web muzzle, since you get into a stupor on such trifles?

Answer 3

Try like this:

exten => s,1,NoOp(IF Busy (100 OR 101) Goto)
    same => n,NoOp(STATE 100: ${DEVICE_STATE(DAHDI/g1/100)})
    same => n,GotoIf($[ ${REGEX("INUSE|BUSY|RINGING|RINGINUSE|ONHOLD" ${DEVICE_STATE(DAHDI/g1/100)})} ]?context,extension,1)
    same => n,NoOp(STATE 101: ${DEVICE_STATE(DAHDI/g1/101)})
    same => n,GotoIf($[ ${REGEX("INUSE|BUSY|RINGING|RINGINUSE|ONHOLD" ${DEVICE_STATE(DAHDI/g1/101)})} ]?context,extension,1)
    same => n,Dial(DAHDI/g1/100&DAHDI/g1/101)
    same => n,Hangup

Answer 4

exten => 100,1,Dial(SIP/100,25,tr); Call arrives at 100, wait 25 seconds.
exten => 100,2,Dial(SIP/101);If not answered within 25 seconds or unavailable, transfer the call to number 101.
exten => 101,1,Dial(SIP/101,25,tr);Call comes on 101, wait 25 seconds.
exten => 101,2,Dial(SIP/100);If there is no answer in 25 seconds or due to unavailability, we transfer the call to number 100.
;i.e. when calling to number 100 or 101, in case of unavailability, there will be a redirect immediately, if the number is available, then we wait 25 seconds for an answer, and if there is no answer, then we redirect.