what port does VoIP use?
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Typically, either H.323 or SIP use a similar method for VoIP.
They both have fixed ports for call setup and call control - HOWEVER (and this tends to be the big problem, especially with noddy firewalls) they both also use dynamic ports (across a wide range) for the RTP (or voice/video content).
Hence, if you're looking at firewall requirements, you'll specifically need a firewall that supports 'statefull inspection' of the VoIP control packets to determine which dynamically assisgned ports to allow comms over.
Hopefully this helps....
Shades
They both have fixed ports for call setup and call control - HOWEVER (and this tends to be the big problem, especially with noddy firewalls) they both also use dynamic ports (across a wide range) for the RTP (or voice/video content).
Hence, if you're looking at firewall requirements, you'll specifically need a firewall that supports 'statefull inspection' of the VoIP control packets to determine which dynamically assisgned ports to allow comms over.
Hopefully this helps....
Shades
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