@Zsparks wrote:
I have an odd problem with phantom ringing on Polycom 550 phones. What's been happening is that a particular phone will start ringing, showing a random (usually 4 digit) CID. The call never goes to voice mail and answering only stops the ringing - there's no connection. Just the one phone is affected at the time but it has happened to four different phones over the last 12 months.
Here's the peculiar part.. The PBX is hosted remotely and is locked down by IP (the PBX can only talk to the provider and this office), the phones are behind NAT and there are NO forwards. Changing the internal static IP address of the phone stops the ringing.
There is no record of these phantom calls in any of the log files on the PBX. If they were originating from the PBX, changing the IP would have no effect.
My guess is that it's coming from something else in the office. I did read a post outlining a similar problem and they blamed their Netgear router (which is what this office has). That would be an easy enough solution, but I'd rather know why.
I guess I'll have to trace packets but was curious to see if anyone else has experienced this.
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