Incoming SIP extension option

I have a external SIP account with a number assigned to it. I am trying to make is so that when someone calls in they are prompted for the extension and when they enter it, it calls the internal line. It currently asks me for the extension but no matter what I enter on my phone it does not go through. My extensions.conf is shown below. Can anyone help?

include => internal

;free speech

exten => 076XXXXXX,1,Answer
exten => 076XXXXXX,n,Background(vm-enter-num-to-call)
exten => 076XXXXXX,n,WaitExten


exten => 7000,1,Macro(voicemail,SIP/bryan)
exten => 7001,1,Macro(voicemail,SIP/mary)
exten => 7002,1,Macro(voicemail,SIP/robert)
exten => 7003,1,Macro(voicemail,IAX2/denis)

To which context calls from your provider is directed? (What’s relevant portion of sip.conf?) Do you mean you want to use WaitExten to allow callers access to those extensions included from [internal]? When you say “does not go through,” what does CLI tell? Is [macro-voicemail] called? What’s the content of [macro-voicemail]?