Avaya IP Office Phone Manager, Installation Manual, Page: 58 / 411

IP Office Installation Page 57
15-601042 Issue 20b (16 July 2009) IP Office
System Overview: Voice Compression Channels
Note: T3 IP devices must be configured to 20ms packet size for the above conditions to apply. If left configured for 10ms
packet size, a voice compression channel is needed for all tones and for non-direct media calls.
Measuring Channel Usage
The IP Office System Status Application can be used to display voice compression channel usage. Within the Resources
section it displays the number of channel in use. It also displays how often there have been insufficient channels available
and the last time such an event occurred.
The IP500 VCM cards, the level of channel usage is also indicated by the LED's (1 to 8) on the front of the IP500 VCM
card .