[localpri-inbound]
exten => 9075550028,1,Goto(local,9075550028,1)
exten => 9075552311,1,Goto(autoattendants,2100,1)
exten => 9075552312,1,Goto(autoattendants,1100,1)
exten => 9075552314,1,Goto(autoattendants,1101,1)
exten => 9075552318,1,Goto(autoattendants,1102,1)

...

[autoattendants]
exten => 1100,1,Goto(autoattendants,aa1130,1)
exten => 1101,1,Goto(autoattendants,aa1150,1)
exten => 1102,1,Goto(autoattendants,aa1160,1)
exten => 1103,1,Goto(autoattendants,aa1170,1)
exten => 1500,1,Goto(autoattendants,aa1530,1)
exten => 1501,1,Goto(autoattendants,aa1550,1)
exten => 1502,1,Goto(autoattendants,aa1560,1)
exten => 1503,1,Goto(autoattendants,aa1570,1)
exten => 1700,1,Goto(autoattendants,aa1730,1)
exten => 2100,1,Goto(autoattendants,aa2130,1)
exten => 2101,1,Goto(autoattendants,aa2150,1)
exten => 3100,1,Goto(autoattendants,aa3130,1)

exten => _aaxxxx,1,Answer()
exten => _aaxxxx,n,Playback(silence/1)
exten => _aaxxxx,n,Playback(welcome)
exten => _aaxxxx,n,ResponseTimeout(1)
exten => _aaxxxx,n,DigitTimeout(5)
exten => _aaxxxx,n,Background(silence/1&if-u-know-ext-dial&otherwise&pls-stay-on-line&silence/5)
exten => _aaxxxx,n,Goto(local,${EXTEN:2},1)
exten => _aaxxxx,n,Hangup()

exten => _[123]xxx,1,Goto(local,${EXTEN},1)

exten => i,1,Hangup()
exten => t,1,Hangup()

...

[local]
...
exten => _2154,1,Macro(stdexten,${EXTEN},Sip/${EXTEN})
...