jenom wrote:My SIP device is an open VDV21
Oh, it's an unlocked Vonage device? I'm not familiar with it. I would need to see a manual with the description of the settings available, and I not finding anything online quickly.
In general, I'm not familiar with formerly locked ITSP devices.
Anyway, I would make sure SIP Passthrough doesn't indicate "Enabled + NAT Helper" in Merlin.
"Enabled+NAT Helper" was causing problems for some people with incoming calls not being received from Rogers network (including Fido).
That IP address belongs to Fibernetics, Cambridge, Ontario , correct ?
Yes, and Fibernetics is the parent company of Freephoneline and Fongo. Your average ping isn't horrible. However, the worst one indicates bad jitter or a ping spike at the very least involving that very specific IP.
I would pay more attention to the very last line or hop in WinMTR, unless that is your last line, which it shouldn't be. If the last line is also bad, then start looking backwards up the list. What you pointed out may be where the problem begins for you. However, a ping spike can also be due an issue on your LAN. Sometimes QoS helps. If the last line doesn't indicate a problem, I would be less inclined to worry.
If you do notice you're getting large ping spikes to the last hop, then while that's occurring, incoming calls may not be received, or they may drop.