Fast busy in VoIP is just a general error.
Have you setup the appropriate port forwarding on your router that's laid out in the troubleshooting guide?
Port Ranges 5060-5080 an 35000-65000 should be forwarded to the device if its behind a router/NAT.
All VoIP networks are designed differently and if port forwarding is not needed for one service, it may be for another depending on how their network is structured.
With VOIPo, we don't handle audio streams so usually when a fast busy comes in, it's usuaully because the phone call connected but then when the audio stream starts and comes from an IP address that the router is not familiar with since it didn't initiate the connection, the router is blocking it. By forwarding all the ports we use, all traffic directed to those ports will go straight to the ATA and this problem will go away. Most routers let it through but some of the more advanced ones block it unless the forwarding is setup.
In terms of ping times, that seems extremely high. Are you sure it's 500-700ms? VoIP is generally not reliable above 100ms. If it's really 500-700ms consistently, I don't think our service is going to work well for you. If you can't get it resolved with support, you can always take advantage of our guarantee and get a full refund as long as you cancel within 30 days and return our equipment.
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