[Asterisk-Users] how to hang the zap channel

[Bartosz Wegrzyn - asterisk]

hello,

I got those extensions:

exten => 555,1,MeetMeCount(500|count)
exten => 555,2,Gotoif,$[${count} = 1]?6
exten => 555,3,Meetme,500|pMs|1234
exten => 555,4,Playback,goodbye
exten => 555,5,Hangup
exten => 555,6,Goto(from-internal-custom,556,1)
exten => 555,7,hangup

exten => 556,1,System(/bin/cp /etc/asterisk/1-test
/var/spool/asterisk/outgoing/)
exten => 556,2,Meetme,500|pMs|1234
exten => 556,3,Hangup

When users call 555 it automatically dials zap channel so
voip users canconference with PSTN users.

When Voip users disconnect the 500 meeting is still active with the zap
channel. How can I write extension to shut the channel down?

Thanks