Mitel 5606 Specifications download pdf (Page 17)

MCD Software Overview

Compression

Bandwidth optimization is a key requirement of VoIP systems: MCD supports G.722.1 and

compresses calls using G.729a. Compression reduces the bandwidth of a call from 64 kbps to

8 kbps plus packet overhead. By using voice compression across the LAN/WAN infrastructure,

you can optimize bandwidth usage for voice calls. The mechanism for managing this feature

is based on zones. You can place groups of MCS devices in zones to compress calls between

zones (not within zones). You can define zones within a controller's LAN infrastructure, between

remote IP devices and the controller, and across the WAN for multiple controller networks.

Most Mitel IP phones inherently support voice compression: calls between IP Phones on the

LAN/WAN infrastructure can be compressed as required. For example, a call between IP Phone

B and IP Phone D (over the LAN or WAN) can be compressed without system compression

resources.

G.729a compression is also supported for calls that have TDM (Digital or Analog) endpoints

that cross the LAN/WAN infrastructure. For example, a call from TDM phone A to IP Phone D

can be compressed using compression resources in controller A to compress the LAN/WAN

segment between Controller A and IP Phone D. The same compression occurs if TDM Phone

A called TDM Phone C over the LAN/WAN, except that in this case compression resources

would be required on both controllers.

You can purchase optional compression licenses and DSP modules to enable TDM-to-IP

compression on the 3300 ICP.

Figure 2: Voice Compression Between 3300 ICPs

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Mitel 5606 Specifications Page 17