I am using an IP 406vs with 4.0 and 2 Vonages lines in my house/Virtual Office.
I have not had any errors with call quality or such, i can even fax and perform remote dialin's into customer modems.
the only thing i have seen so far is that while caller id works and Call Waiting works (you hear a beep and program a flash button and it's good to go) the Caller ID for Call Waiting does not work nor does it show up as a second call on the phone, just the Call Waiting beep like on a home line.
Although analog "works" with an IPO, it's not great. You will likely get echo, you will always loose at least the first incoming ring while the IPO waits for caller ID info, etc.
If your customer's system supports 4.0 firmware and has some VCM resources, I would recommend going with a SIP provider. Then you don't have the digital (Vonage Service) to analog (Vonage Adapter) back to Digital (IPO Box) conversions going on.
There are services available that offer DID service, routed VOIP to your IP-PBX. I have not used them, but wonder how well they work. Anyone have any experience with them? If they work well, this might be something to consider, or test.
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