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Specifications
Release 3.3 35
E2T Compression
The 3300 ICP supports G.729ac voice compression. The compression of a standard call
effectively reduces the voice payload bandwidth required per call from 64 kbps to approximately
8 kbps plus packet overhead. Voice compression on the 3300 ICP can be divided into two
types: IP phone-to IP phone and IP phone to TDM/analog devices.
With IP-phone-to-IP phone connection, where included, voice compression is handled by the
phone’s own DSP resources. An exception to this is when a basic IP set is used such as the
Mitel Networks 5001 IP Phone, 5201 IP Phone, 5005 IP phone or 5205 IP Phone.
For an IP phone to a non IP device G.729ac compression will be provided through the purchase
of compression licenses and 21161 Quad DSP Modules. One DSP module provides up to 32
channels of voice compression. The 250 User and 700 User controllers have the capacity for
the installation of two modules providing a maximum of 64 channels of compression.
Compression is carried out by the 21161 Quad DSP under the control of the E2T.
Compression zones are programmed on the 3300 ICP. Phones are typically put in the default
zone which does not have compression turned on and all calls within this zone will not be
compressed. Phones can be placed on other zones and compression may be turned on or off.
Full details are covered in the System Administration Tool online help.
In the following example, when an IP device (assigned to a non-default zone) calls a TDM
device, G.729ac compression will be invoked on the LAN or WAN side of the call providing
there are adequate compression resources available in the controller.
The same applies to calls that originate from a TDM device and terminate on an IP device
assuming compression is required.
Transfer Dial -8
-12
-7
-11
-5
-9
-10
-14
-4
-8
-3
-7
-4
-8
-4
-8
-5
-9
-4
-8
Voice Mail -19 -18 -16 -21 -15 -14 -15 -15 -16 -15
Note: DTMF tones are supported.
Note: Digital (DGS) and IP (WAN) tones are conveyed as (RTP) packets.
Note: "---" indicates that this interface is not supported in this country.
Tone Output Level
iONS ONS iOPS OPS iACO
iACO
s
ACO ACOs DCO ATT
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