Setting Wan Bandwidth Limits Between Network Regions - Avaya Communication Manager Administrator's Manual

Planning the System

Setting WAN Bandwidth Limits Between Network Regions

Each phone in a Call Coverage path now rings twice before the call routes to the next coverage
point. The
number of rings before the call is forwarded when you use Call Forwarding for busy/don't answer
calls. This applies only to calls covered or forwarded to local extensions. Use Off-Net to set the
number of rings for calls forwarded to public network extensions.
Setting WAN Bandwidth Limits Between Network
Regions
Using the Communication Manager Call Admission Control: Bandwidth Limitation (CAC-BL) feature,
you can specify a VOIP bandwidth limit between any pair of IP network regions, and then deny calls that
need to be carried over the WAN link that exceed that bandwidth limit. Bandwidth limits may be
administered in terms of:
•
Kbit/sec WAN facilities
•
Mbit/sec WAN facilities
•
Explicit number of connections
•
No limit
It is highly recommended that you have the following design information before setting the bandwidth
limits and mapping the connections:
1
Network topology and WAN link infrastructure.
2
An understanding of the Committed Information Rate (CIR) for the WAN infrastructure.
3
Overlay/design of the Network Regions mapped to the existing topology.
4
Codec sets administered in the system.
5
Bandwidth is assumed to be full duplex.
The following table can be used to help assess how much bandwidth (in Kbits /sec) is used for various
types of codeecs and packet sizes. The values shown assume a 7 byte L2 WAN header (and are rounded
up).
Table 3: Bandwidth usage (in Kbits/sec) based on packet size and codec selection
Packet Size
G.711
G.729
G.723-6.3
G.723-5.3
These values, when compared to the actual bandwidth used for 8 byte as well as 10 byte L2 WAN headers
are not significantly different. In some cases, the rounded up values shown above are greater than values
used for 10 bytes.
68
Local Cvg Subsequent Redirection/CFWD No Ans Interval
10 ms 20 ms
102 83
46 27
NA NA
NA NA
Administrator's Guide for Avaya Communication Manager
30 ms 40 ms
77 74
21 18
19 NA
18 NA
field also controls the
50 ms 60 ms
72 71
16 15
NA 13
NA 12
November 2003