;numbers have been changed to protect the innocent

[inbound]
exten => 6468625555,1,Goto(home,s,1)                          ;inbound did goes to home ivr
exten => 12123815555,1,Goto(conference,s,1)                    ;go strait to conference context

;snip.... 

[conference]
exten => s,1,Wait(3)
exten => s,n,Playback(welcome)
exten => s,n,MeetMe(100|p)
exten => s,n,Playback(vm-goodbye)
exten => s,n,Hangup

;snip

[home]
exten => s,1,Background(home_ivr)                                ;play ivr menu

;....

[sip-general]        ;all sip clients are a member of sip-general
include => inbound
include => outbound