VoIP UDP ports

From: Niksa Tomulic (ccie@otokrab.net)
Date: Thu Apr 10 2003 - 07:22:34 GMT-3

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Hi,
Reading trough QOS for VoIP, and using ACLs to identify VoIP traffic, I
can't find definite reference about which ports VoIP traffic use.
There are different examples by Cisco what I've seen so far:

For sure there is TCP port 1720 which is used for H.323 signaling
traffic, but: for VoIP itself I've seen different examples, and they all
state "common UDP ports used by VoIP":

EX 1
access-list 100 permit udp any any range 16384 32767

EX 2
access-list 100 permit udp any any range 16384 32000

And with this command, again different:

ip rtp priority 16384 16383 40

Any thoughts?

Thanks,
niksa

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