Today I found how Vonage can be added as a trunk to PBXes. It depends on whether you have Vonage SoftPhone or just a regular calling plan.
If SoftPhone, use the following settings:
If regular calling plan, the setup is a bit more involved. You'd first have to find out what you "encrypted" vonage password is. The easiest way to do that is to type this address in your browser:
replacing YOUR_VONAGE_USERNAME and YOUR_VONAGE_PASSWORD with the username and pass you use to login to your vonage account. This will return a webpage with various settings and you only need to worry about the fist 4 lines:
Now, enter these in PBXes as follows:
Voila! Hope this helps... (taken from http://www.modmyi.com/forums/native-ipho...t-iphone-2.html)
I tried this, but unfortunately... I think they changed the url... can you look at it again to be sure it is correct??