Channel              Location             State   Application(Data)
SIP/111-b6f0bbc0     1@TRGMAINMENU:4      Up      Page(SIP/110&SIP/112&SIP/101&S
SIP/125-b6f0f020     1@TRGMAINMENU:4      Up      Page(SIP/110&SIP/112&SIP/101&S
SIP/101-b6f0d5f0     1@TRGMAINMENU:4      Up      Page(SIP/110&SIP/112&SIP/101&S
SIP/125-b6f08760     1@TRGMAINMENU:4      Up      Page(SIP/110&SIP/112&SIP/101&S


/etc/asterisk/extensions.conf

[TRG]
exten => 0,1,Goto(TRGMAINMENU,s,1)

[TRGMAINMENU]
        exten => s,1,Answer
        exten => s,2,Background(TRGMAINMENU)
        exten => s,n,WaitExten(5)
        exten => s,n,Goto(TRGMAINMENU,s,2)
        exten => 1,1,Answer
        exten => 1,n,SIPAddHeader(Alert-Info: Auto Answer)
        exten => 1,n,Wait(1)
        exten => 1,n,Page(SIP/110&SIP/112&SIP/101&SIP/102&SIP/103&SIP/104&SIP/105&SIP/106&SIP/107&SIP/108&SIP/109&SIP/111&SIP/113&SIP/114&SIP/115&SIP/116&SI\
P/117&SIP/118&SIP/124&SIP/126&SIP/127&SIP/128&SIP/129&SIP/130)
        exten => 1,n,Hangup