Mitel 430 System Manual page 46

Expansion Stages and System Capacity
audio channel is assigned a DTMF receiver for enabling user inputs during play-
back. Licences (Enterprise Voice
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 48). Announcement
service and music on hold use their own resources.
The number of configurable audio channels depends on both the configured mode
(see "Voice-mail system modes of operation", page 49) and the type of DSP chip
(see "Configuration of DSP chips", page 49).
• 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-
ceivers – depends on the number of users with integrated mobile/external phones
who want to use this functionality simultaneously.
One Mobile or External Phone Extension
bile/external phone.
• CAS
CAS (Channel-associated signaling) is a signalling protocol for PRI network inter-
faces used in certain countries (e.g. Brazil). This setting provides the tone sender
and receiver for transmitting signalling information.
Use of VoIP channels
VoIP channels are always required between IP and non-IP endpoints. They are freely
available, i.e. they are always used wherever they happen to be needed. The figure
below gives an overview of the cases where VoIP channels are needed and how many
of them
46
Mail, Audio Record & Play
licence is required for each integrated mo-
Channels, Auto Atten-
Mitel 415/430 as of R4.1
syd-0580/1.2 – R4.1 – 08.2016