; Config 1 - doesn't work
[vmb]
exten => 500,1,VoiceMailMain(smain)
exten => 80,1,VoiceMailMain()
exten => 81,1,VoiceMailMain(s110)

[internal]
include => local
include => sip_out
include => uk_geo
include => vmb

; This is the error it produces
Jun 29 15:48:08 NOTICE[5487]: app_dial.c:1040 dial_exec_full: Unable to create channel of type 'SIP' (cause 3 - No route to destination)
  == Everyone is busy/congested at this time (1:0/0/1)

; Config 2 - works
[internal]
include => local
include => sip_out
include => uk_geo

exten => 500,1,VoiceMailMain(smain)
exten => 80,1,VoiceMailMain()
exten => 81,1,VoiceMailMain(s110)

[uk_geo]
exten => _01.,1,Dial(${UKGeographical}/${EXTEN})
exten => _02.,1,Dial(${UKGeographical}/${EXTEN})