Calls intermittently going directly to voicemail

[Russell]

I think you are right. If you have to do port forwarding and forward the entire range, I assume you can't have two adapters behind your router. Also, there could be other applications that are using UDP ports in that range. PAP2 provides the fields for RTP port range. You could set the port range different for different adapters. Even with that port forwarding depends on the way your router translates the port numbers.

As Brandon mentioned the PAP2 RTP port range is used for outgoing calls only. So, I'm not sure if setting different ranges will affect incoming - incoming is up to the "media gateway" to pick a port from the 60K range. We don't know as to exact mechanics of how setup works - not sure how the incoming port is picked. Does each gateway pick a destination port using some internal algorithm (with no negotiation with your router) and start sending UDP packets to your public IP at that port?

[tritch]

For those who are reluctant to open this port range or have other devices that may conflict, the solution may be to have Voipo directly handle your audio instead of the media gateways. It's possible they may use a specific port or smaller port range for RTP traffic. A quick question to support should answer this. The only drawback is that it may increase your latency as quoted by one of Voipo's staffers below:

Another thing to keep in mind -- while having VOIPo handle your audio directly does ensure the quality of data; it can sometimes come at the expense of increased latency with the RTP transmission (in situations where a terminating media gateway is significantly closer from a geographical perspective).