Can you find the link to the thread? I dug up pieces of custom context from extensionsadditional.conf but I dont know if this is all of it.
[not-3000]
include => not-3000-custom
include => outbound-allroutes
include => outrt-2
include => outrt-4
include => outrt-1
include => outrt-3
include => not-3000_bad-number
include => bad-number
exten => _11xx,1,Goto(not-3000_rulematch,${EXTEN},1)
exten => _31xx,1,Goto(not-3000_rulematch,${EXTEN},1)
exten => _32xx,1,Goto(not-3000_rulematch,${EXTEN},1)
exten => _40xx,1,Goto(not-3000_rulematch,${EXTEN},1)
exten => _60xx,1,Goto(not-3000_rulematch,${EXTEN},1)
exten => s,1,Macro(hangupcall,)
exten => h,1,Macro(hangupcall,)
;–== end of [not-3000] ==–;
[not-3000_rulematch]
include => not-3000_rulematch-custom
include => parkedcalls
include => from-internal-custom
include => app-cf-busy-off
include => app-cf-off
include => app-cf-busy-prompting-on
include => app-cf-busy-on
include => app-cf-busy-off-any
include => app-cf-off-any
include => app-cf-on
include => app-cf-toggle
include => app-cf-unavailable-prompt-on
include => app-cf-unavailable-on
include => app-cf-prompting-on
include => app-cf-unavailable-off
include => ext-cf-hints
include => app-callwaiting-cwoff
include => app-callwaiting-cwon
include => ext-meetme
include => app-daynight-toggle
include => app-dictate-record
include => app-dictate-send
include => app-dnd-off
include => app-dnd-on
include => app-toggle
include => ext-dnd-hints
include => app-fax
include => app-fmf-toggle
include => ext-findmefollow
include => fmgrps
include => app-hotelwakeup
include => app-calltrace
include => app-echo-test
include => app-speakextennum
include => app-speakingclock
include => ext-intercom-users
include => park-hints
include => app-parking
include => app-pbdirectory
include => ext-queues
include => app-recordings
include => ext-group
include => grps
include => app-speeddial
include => vmblast-grp
include => app-dialvm
include => app-vmmain
include => app-blacklist
include => app-userlogonoff
include => ext-local-confirm
include => findmefollow-ringallv2
include => app-pickup
include => app-chanspy
include => ext-test
include => ext-local
include => outbound-allroutes
include => outrt-2
include => outrt-4
include => outrt-1
include => outrt-3
include => not-3000_bad-number
include => bad-number
exten => s,1,Macro(hangupcall,)
exten => h,1,Macro(hangupcall,)
;–== end of [not-3000_rulematch] ==–;
[not-3000_bad-number]
include => not-3000_bad-number-custom
;–== end of [not-3000_bad-number] ==–;