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Just answered my own question
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I have just signed up for Phone.com service. &nbsp;I was originally going to use sipgate and asterisk, but then opted for the loss of control instead of the cost of buying the gear, since the service is $24 a month. &nbsp;Needless to say, it will take several years to recoup the cost of my server, not to mention the time to actually learn how to do it all. <br />
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In any case, the new physical phones are Cisco 508g, and the outbound call works well. &nbsp;The inbound not so good. &nbsp;But what I think it is going on is the idle timeout is cutting the connections so the phone cannot receive a call. &nbsp;I looked to their forums, but haven't really found anything, not to mention, most of the posts are fairly stale. &nbsp;My firewall is a sonicwall 100tz, and the only thing I can find is the UDP timeout, and not sure if I want to adjust that, and if so, how much longer do I want it?
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I have just signed up for Phone.com service.  I was originally going to use sipgate and asterisk, but then opted for the loss of control instead of the cost of buying the gear, since the service is $24 a month.  Needless to say, it will take several years to recoup the cost of my server, not to mention the time to actually learn how to do it all. 

In any case, the new physical phones are Cisco 508g, and the outbound call works well.  The inbound not so good.  But what I think it is going on is the idle timeout is cutting the connections so the phone cannot receive a call.  I looked to their forums, but haven't really found anything, not to mention, most of the posts are fairly stale.  My firewall is a sonicwall 100tz, and the only thing I can find is the UDP timeout, and not sure if I want to adjust that, and if so, how much longer do I want it?

Phone.com service and my sonicwall

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.