Mitel Aastra 470 System Manual page 48

Expansion Stages and System Capacity
DSP resources for the real-time processing of the call data. VoIP channels are al-
ways required between IP and non-IP endpoints, e.g. for internal connections
between an SIP/IP phone and a digital system phone or e.g. for an external user
who is routed to the internal voice mail system via an SIP network interface. In
an AIN VoIP channels are also used for call connections between the nodes (see
"Use of VoIP channels", page 50
The number of configurable VoIP channels depends on both the type of DSP
chip (see "Configuration of DSP chips", page
"Standard Media Switch modes of operation", page
If the VoIP mode is set to G.711, two G.711 VoIP channels per system can be used
without a licence. One
quired for each additional VoIP channel.
Note
the IP media gateway function can also be provided with IP media
modules. The necessary DSP 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
module", page
• FoIP
For reliable real-time fax transmissions via an IP network using the T.38 fax pro-
tocol (ITU-T). FoIP channels can be used without a licence.
• Audio services
These voice channels are used to play back and record audio data. Additionally,
each audio channel is assigned a DTMF receiver for enabling user inputs during
playback. This requires licences
nels, Auto Attendant) and DSP resources.
The voice channels can be used for voice mail, auto attendant or call recording.
The allocation is configurable (see
The number of configurable voice channels depends on the type of DSP chip
(see "Configuration of DSP chips", page
Note
With the Aastra 470 communications server G.711 voice channels are
always used for voice mail, auto attendant and call recording. The
parameter SVM mode can therefore not be changed for this system.
48
for an overview).
VoIP Channels for Standard Media Switch
54).
(Enterprise Voice
"Reserving audio channels", page
52).
52) and the configured mode (see
51).
licence is re-
Mail, Audio Record & Play Chan-
syd-0337/1.6 – R3.2 – 09.2014
"IP media
51).
Aastra 470 as of R3.2