Nortel Networks NN43001-314 - Manual (Page 180)

180 Planning and management
• jitter
CAUTION
Service Interruption
If the network is planned so IP Phones use a different route
to the main office than the MG 1000B TPS, a fault condition
can occur. When the MG 1000B TPS can "ping" the main
office but the IP Phone cannot "ping" the main office due to
a network outage, an IP Phone registration can force the
telephone into a cycle of registering locally, being redirected to
the main office, rebooting and then registering locally again.
When this cycle occurs, further diagnose the network outage.
Information about these and other measurements of voice quality on VoIP
calls can be obtained using the Proactive Voice Quality Management (PVQ)
feature. Refer to
"Proactive Voice Quality management" (page 188)
LAN/WAN bandwidth requirements
The LAN/WAN bandwidth requirement between the main office and Branch
Office consists of two components — one for the media path and the other
for signaling and background tasks.
The LAN/WAN bandwidth requirement for the media path depends on the
following factors:
• traffic pattern at the Branch Office
• chosen packetization delay
• Voice Activity Detect
• codec
• Link type
Detailed information about traffic information is contained in the
Communication Server 1000E: Planning and Engineering (NN43041-220)
NTP. An example for the MG 1000B is given in
Appendix "Branch Office
engineering example" (page 371) .
Signaling and background tasks that use LAN/WAN bandwidth include:
• NRS polling
• NRS database synchronization
• Endpoint registration requests to NRS
• Lamp Audit
• IP Phone Keep Alive messages
• Call signaling to and from IP Phones
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.