We recently installed some cisco voice modules in routers to give us a
phone connection between our home office and our equipment rack at our
colocation facility (actually, it's very cool having an extension of our
in-house phone system located a mile away).
Watching the traffic on the VPN, an IP telephony call uses three ports (all
connections initiated by the "calling" router):
TCP 1720 - always
TCP 111xx - varies for each connection
TCP 163xx - varies for each connection (and one back-connection on another
port)
Does anyone have any pointers for documentation on exactly which ports are
used for this? I don't want to leave everything wide open.
Thanks...
Dave Grabowski
System Arts, Inc.
(212) 604-9015 x316
[EMAIL PROTECTED]
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