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66 Planning
Before adding the WLAN IP Telephony Manager 2245 to the network:
•
Ensure that the APs used in the network are Voice Interoperability
for Enterprise Wireless (VIEW) certified. For more information, go to
w
ww.spectralink.com/co nsumer/partners/view_certification.jsp.
•
Ensure that the handsets are running Nortel Phase II software (97.070
or greater).
Figure 10
Maximum delay, jitter and packet loss
Strict timing requirements dictate that the WLAN IP Telephony Manager
2245 must be placed as close as possible to the handsets, ideally in the
same subnet.
End-to-end jitter, delay and packet loss budget is a general VoIP best
practice:
•
End-to-end delay is the time it takes for voice to go from the microphone
of the sending telephone to the earpiece of the receiving telephone.
•
End-to-end jitter must not exceed 30 ms north of the SVP server (PBX to
the WLAN IP Telephony Manager 2245) and must not exceed 1 ms south
of the SVP server (the WLAN IP Telephony Manager 2245 to the AP).
•
End-to-end packet loss is the number of packets that are lost in the
network.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.