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Troubleshooting dial tone on VoIP phone system

I have implemented VoIP on a pure IP network. I had to use VPN to make it work. Now is it takes a long time for the dial tone to come up on any of the phones at one particular site. Where do I begin troubleshooting?
This is a difficult problem to troubleshoot without knowing the network topology and exact devices being used. If you are using IP phones, they typically provide a local dial tone, meaning the actual dial tone you hear comes from the phone. Some IP phones and analog telephony adapters do not provide dial tone unless they are registered properly with the IP PBX or server. Depending upon the state of your VPN tunnel, messages may not get through at certain times, causing delays in registration and therefore in the ability to receive local dial tone.

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