the Google Voice dial tone
MichiganTelephone:
I think part of the reason for the confusion here is that unless I'm wrong, the OBi device will only send dial tone to the Phone port. It's not designed to provide dial tone to anyone coming in over a Service Provider or OBiTALK network channel.
What I don't understand is why you're trying to force users to do two stage dialing in the first place. Just let them dial the number they want, and let Asterisk process it and send it to Google Voice via your OBi device. See How to use the Obihai OBi100 or OBi110 VoIP device as a gateway between Asterisk/FreePBX and Google Voice and/or the OBiTALK network (note that these instructions are rather specific to a setup that includes FreePBX, but even if you are running bare Asterisk you should be able to use the same principles outlined in that article, particularly with respect to how you configure your OBi device).
If for some reason you really want them to hear a second dial tone, the best place to provide that is in their endpoints, but not all endpoints have the capability to provide a second dial tone (if they can do it, you usually have to program it into their dial plan or digit map). Sending touch tone digits over a VoIP connection is not always 100% reliable, depending on several factors such as the codec(s) used in the call path. It's much better to have your users dial the number they want to call (with or without a routing prefix), send the entire number from their endpoint to Asterisk, and let Asterisk figure out how to route it.
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