Nortel Networks NN43001-563 - Manual (Page 132)

132 ITG engineering guidelines
Port numbers used by IP Trunk 3.01 (and later)
Table 25 "Pre-defined TCP ports" (page 132) and Table 26 "Pre-defined
UDP ports" (page 132) list the pre-defined ports used by IP Trunk 3.01
(and later).
Table 25
Pre-defined TCP ports
Network interface Port use Port number
ELAN DCHIP inter-card messaging 6001
TLAN H.225 TCP port 1720
(destination port only)
Table 26
Pre-defined UDP ports
Interface Port use Port number
ELAN BOOTP Server 67 (on Leader card)
ELAN SNMP 161
TLAN RTP Ports 2300 – 2362
(TCID*2 + 2300)
or
17300 – 17362
(TCID*2 + 17300)
TLAN RTCP Ports 2301 – 2363
(TCID*2 + 2300 + 1)
or
17301 – 17363
(TCID*2 + 17300 + 1)
QoS fallback thresholds and IP Trunk 3.01 (and later)
In IP Trunk 3.01 (and later), QoS remains in effect when communicating
between non-Gatekeeper-routed endpoints (IP Trunk 3.01 (and later)
endpoints). For more information, see
"Fallback threshold" (page 165) and
"Setting the QoS threshold for fallback routing" (page 165) .
However, QoS fallback for Gatekeeper-routed calls (calls to
Gatekeeper-routed endpoints) is not possible. This is because the calls
routed by the Gatekeeper can be directed to a variety of endpoints, some of
which might not have direct PSTN connectivity.
A well engineered network greatly reduces the need for QoS fallback to
PSTN. A well engineered network includes the following features:
• implementing network QoS features such as DiffServ and 802.1Q/p to
give priority to real-time voice traffic
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.