You can put this in your dialplan:
|<7:johndoe@sip.nonoh.net>|
which means that if you dial "7" you will be connected to Johndoe.
You have to be prepared that it only works if John logged in or made a phonecall a few minutes ago. The registration at Betamax expires after a few minutes. The connection doesn't stay alive long. Betamax doesn't really support inbound calls.
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