Mitel 5560 IPT none Specifications download pdf (Page 204)

Engineering Guidelines

190

IP trunk routes and compression

The IP trunk route is a virtual path from one 3300 ICP to another 3300 ICP. One of the parameters

assigned to this route is compression. Assuming that the end devices are capable of

compression, compression is enabled on the route, and there are sufficient available channels,

or sessions, then the end devices stream using compression. Otherwise the call is blocked,

rerouted, or streamed with G.711 (uncompressed).

See “Network Configuration Concepts” on page 191 for more details on bandwidth requirements

for different LAN and WAN links with and without compression.

IP networking and compression licenses

Compression and available bandwidth affect voice quality. Compression sessions and IP

networking require licenses. Setting different compression zones and assigning different IP

phones to the different zones determines when to use compression licenses. The IP networking

license determines whether calls can be routed between units over its IP infrastructure, and

how many of the sessions are allowed over a particular connection between different controllers.

Compression and IP networking work together, but can also be used independently.

From a voice quality view, if the number of calls requiring compression exceeds the number of

licenses, a call does not fail, but it is not compressed. It will use more bandwidth than expected.

The section “Bandwidth Requirements” on page 206 discusses bandwidth calculations. If IP

trunks are used, the number of concurrent sessions can also be defined; see the section “IP

networking limit working example” on page 223.

Compression and licenses

Some guidelines for compression licenses and connections in IP:

• An IP phone-to-IP phone connection does not use a compression license in the 3300 ICP

when the call is connected by an IP trunk over a WAN.

• An IP phone (node A) to TDM phone (node B) call uses an E2T compression license on

node B only when the call is connected by an IP trunk over a WAN and the call is compressed

across the IP trunk.

• A TDM phone (node A) to TDM phone (node B) call uses an E2T compression license on

both nodes A and B when the call is connected by an IP trunk over a WAN and the call is

compressed across the IP trunk.

• Conference calls use one compression license for each IP connection in the conference

that would normally require a compression license when connected to a TDM device.

• Compression can be used with calls to voice mail. Each of these calls consumes a com-

pression license if the call would normally use compression when connected to a TDM

device.

• Music-on-Hold (MOH) that is passed to a device that normally uses compression consumes

a compression license. If MOH is passed to multiple devices, then multiple licenses are

required, matching the number of devices.

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Mitel 5560 IPT none Specifications Page 204