Nortel Networks NN43001-563 - Manual (Page 229)

Configure dialing plans within the corporate network 229
Turn on Step Back on Congestion for the IP Trunk 3.0 (and later) trunk
route
For the IP Trunk 3.01 (and later) trunk route entry in the Route List Block
(RLB), enter RRA at the Step Back on Congestion (SBOC) prompt. This
enables fallback to alternate circuit-switched trunk routes in the following
situations:
• due to network QoS falling below the defined threshold for the IP Trunk
3.01 (and later) node
• when there are no ports available at the destination IP Trunk 3.01 (and
later) node
Turn off IP Trunk 3.01 (and later) route during peak traffic periods on
the IP data network
Based on site data, if fallback routing occurs frequently and consistently
for a data network during specific busy hours (for example, every Monday
10-11am, Tuesday 2-3pm), these hours should be excluded from the RLB
to maintain a high QoS for voice services. By not offering voice traffic to a
data network during known peak traffic hours, the incidence of conversation
with marginal QoS can be minimized.
The time schedule is a 24-hour clock which is divided up the same way
for all 7 days. Basic steps to program Time of Day for IP Trunk 3.01 (and
later) routes are as follows:
1. Go to LD 86 ESN data block to configure the Time of Day Schedule
(TODS) for the required IP Trunk 3.01 (and later) control periods.
2. Go to LD 86 RLB and apply the TODS on/off toggle for that route list
entry associated with an IP Trunk 3.01 (and later) trunk route.
ESN5 network signaling
The original ITG-T ISDN application had two major categories of endpoints:
• ISDN-capable endpoints
• Non-ISDN endpoints
ESN5 information transmission is a mechanism allowing the transmission
of NCOS information. ESN5 digit transmission was added when the ISDN
capability was added to ITG Trunks. ITG Trunk ISDN endpoints were
able to insert the ESN5 prefix in an outgoing message if necessary, and
did so based on the information in the dialing plan tables. This was the
only possible alternative, since the flag indicating the type of ESN5 prefix
and the two prefix digits were also legitimate dialed digits. Non-ISDN
endpoints were, by definition, unable to handle ISDN, and therefore were
not ESN5-capable.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.