Expansion Stages and System Capacity
51
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
nels are also used for call connections between the nodes (see "Use of VoIP chan-
nels", page 53 for an overview).
The number of configurable VoIP channels depends on both the type of DSP chip
(see "Configuration of DSP chips", page 55
) and the configured mode (see "Stand-
ard Media Switch modes of operation", page 54).
If the VoIP mode is set to G.711, two G.711 VoIP channels per system can be used
without a licence. One VoIP Channels for Standard Media Switch licence is required
for each additional VoIP channel.
Note
the IP media gateway function can also be provided with IP media modules. The necessary
media resources are located on the IP media modules themselves. Standard media switch
and IP media switch are independent of each other and can be used as a mix (see "IP
media module", page 57).
• FoIP
For reliable real-time fax transmissions via an IP network using the T.38 fax protocol
(ITU-T). FoIP channels can be used without a licence.
• Audio services
The audio channels are used to play back and record audio data. Additionally, each
audio channel is assigned a DTMF receiver for enabling user inputs during play-
back. Licences (Enterprise Voice Mail, Audio Record & Play Channels, Auto Atten-
dant) and media resources are required for this.
Audio channels can be used for voice mail, auto attendant, queue with announce-
ment, call recording, announcement with audio file, or conference bridge. The allo-
cation is configurable (see "Reserving audio channels", page 54
). Announcement
service and music on hold use their own resources.
The number of configurable audio channels depends on the type of DSP chip (see
"Configuration of DSP chips", page 55).
Note
On the Mitel 470 communication server G.711 audio channels are always used for audio
services. The Voice mail mode parameter can therefore not be changed for this system.
• GSM
Enhanced functionality is achieved for integrated mobile/external phones by provid-
ing special DTMF receivers during the call connection. Suffix dialling functions (such
as enquiry calls or setting up a conference with function codes ) can be carried out
as a result. The number of GSM channels – and therefore the number of DTMF re-
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