I was getting ghost ringing into my Polycom because my router sensibly
remaps phone:5060 to WAN_IP:5060. My solution was to switch to SIP TCP.
On 11/20/2015 03:14 PM, Carlos Alvarez wrote:
We're starting to see customers who get random arbitrary ringing caused
by a random connection attempt from the internet. Most of our customers
have Cisco routers with full-cone NAT, so it's easy to do that. We
don't reinvite handsets, we proxy the media, so we've considered using
restricted NAT instead. If we can figure out how, we can't find any
documentation on how to do it, and don't have a response to our Cisco
TAC case on it yet.
But I figured I'd ask if others have come up with better solutions. I
know there are a few authentication options in the phones themselves,
but they seem to vary greatly by vendor and even by model. I like to do
things as simply and system-wide as possible. We primarily sell
Grandstream, and we support Cisco/Linksys SPA as well as Polycom IP
series (not VVX).
We're an Asterisk-based hosted service provider.
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Alex Balashov | Principal | Evariste Systems LLC
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