Nortel Networks NN43001-563 User Manual download pdf (Page 320)

320 Provisioning IP Trunk 3.01 (and later) in TM 3.1

The QoS feature only works if the far end is an IP Trunk 3.01 (and later) or

an ITG Trunk 2.x node. Additionally, there must be a fallback route for the IP

Trunk 3.01 (and later) node to use to reach the far end, such as a PRI trunk.

Otherwise, if the QoS level between the two nodes falls below the threshold,

calls can no longer be made. If the far end is an IP Peer endpoint and QoS

is turned on, calls cannot be made to that node.

IP Peer Networking does not support the QoS messages sent from the IP

Trunk 3.01 (and later) node. If QoS is turned on, the IP Trunk 3.01 (and

later) node interprets this as a node that is unreachable.

Another concern when using QoS monitoring is the effect of the additional

trafﬁc generated by QoS messages being sent between nodes. If all nodes

have QoS enabled, the effect of adding one additional node nearly doubles

the number of QoS messages being sent.

For example:

A two-node network will generate 2 QoS messages.

A three-node network will generate 6 QoS messages.

A four-node network will generate 12 QoS messages.

A ﬁve-node network will generate 20 QoS messages.

The formula that can be used is:

Number of QoS messages sent = x

–x

where x = number of nodes using QoS

QoS monitoring might need to be turned off for IP Trunk 3.01 (and later)

nodes using low bandwidth connection. For more information on how to

properly engineer the network, refer "ITG engineering guidelines" (page 87).

Dialing plan types

There are six kinds of dialing plans supported with IP Trunk 3.01 (and later):

1. NPA – North American Area codes (the 613 in 1-613-555-1212). A

maximum of 7 digits are supported; for example, 1-613-555.

2. NXX – North American Exchange, the ﬁrst three numbers of a local

number; for example, the 555 in 1-613-555-1212).

3. LOC – Location Code. A code for a particular location. Each LOC must

be leftwise-unique. For example, 011 and 0112 are not unique, but

011 and 012 are unique. The maximum number of digits supported is

7 digits.

4. SPN – Special Cases. This is for routing international calls or special

cases; for example, 011923xxxx or 911. The maximum number of digits

supported is 19 digits.

Nortel Communication Server 1000

IP Trunk Fundamentals

NN43001-563 02.01 Standard

Release 5.5 21 December 2007

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Nortel Networks NN43001-563 User Manual Page 320