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; Some dialplan extension
same => n,Set(CHANNEL(hangup_handler_push)=hdlr3,s,1(args));
same => n,Set(CHANNEL(hangup_handler_push)=hdlr2,s,1(args));
same => n,Set(CHANNEL(hangup_handler_push)=hdlr1,s,1(args));
; Remove hdlr1
same => n,Set(CHANNEL(hangup_handler_pop)=)
; Replace hdlr2 with hdlr4
same => n,Set(CHANNEL(hangup_handler_pop)=hdlr4,s,1(args));

; Continuing in some dialplan extension

[hdlr1]

exten => s,1,Verbose(0, Not Executed)
same => n,Return()

[hdlr2]

exten => s,1,Verbose(0, Not Executed)
same => n,Return()

[hdlr3]

exten => s,1,Verbose(0, Executed Second)
same => n,Return()

[hdlr4]

exten => s,1,Verbose(0, Executed First)
same => n,Return()