From: Mas Kato (tealp729@xxxxxxxx)
Date: Thu Jun 14 2001 - 11:48:21 GMT-3
>From Network Computing's Network Design Manual:
"To start things off, the H.323 terminal originating a call (caller)
makes a TCP connection to the well-known port for H.323, port 1720. The
terminal being called (callee) and the caller exchange Q.931 packets
across this connection to propose ephemeral (dynamic and greater than
1024) ports that will be used from this point forward to exchange H.245
system control information."
The ephemeral port range for Cisco IOS seems to start at 11000 (does
anyone know if this is documented anywhere?), so it looks like this
range does need to be considered for H.245 control information. When
filtering, note that other protocols seem to pull from this range as
well--for example, BGP and DLSW+ over TCP.
Mas
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Darren Ward
Sent: Thursday, June 14, 2001 6:50 AM
To: ccielab@groupstudy.com
Subject: VOIP Ports
I know we've gone over this before but there was still some argument
about the ports to be used.
What I've seen so far is that:
H225 requires TCP port 1720
H245 requires TCP port range 11000 to 11999
VOIP RTP requires UDP port range 16384 to 32767
Now several texts do not refer to the use of H245 ports as required, one
of them is the CCIE Prac Kit which has been rebuked for errors before.
So what I'm wondering is whether a plain router to router VOIP dial-peer
requires all ports mentioned above?
Is the entire 11000 to 11999 required for H245?
Any word from anybody on anything above?
Darren
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