Danny Nicholas wrote:
IAX uses one port; SIP uses 2-4 per call. We use Polycom 550’s to talk to an Asterisk 10.X box. Nothing special on the Asterisk side; just have to get your VPN to talk to the Asterisk network.
To be slightly pedantic SIP UDP generally uses a single port (5060). RTP generally uses two ports (one for RTP and one for RTCP). If you have multiple media streams (one audio and one video) those are two RTP sessions, so a total of 4 ports. If you have only an audio stream then that is a total of 2 ports.
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