Expansion Stages and System Capacity
44
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
both the type of DSP chip (see
"Configuration of DSP chips", page 47
) and the
"Standard Media Switch modes of operation", page 46
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
).
•
FoIP
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.
•
VM/AA
These voice channels are used to play back voice mail greetings, voice messages
or the audio guide from the Auto Attendant. Each voice channel is also assigned
a DTMF receiver to allow user inputs during playback. This requires licences and
DSP resources. The voice channels can be used for voice mail (VM) or Auto At-
tendant (AA). The allocation is configurable (see
). The number of configurable voice channels depends on the type of
DSP chip (see
"Configuration of DSP chips", page 47
Note
With the Aastra 470 communications server G.711 voice channels are
always used for voice mail and Auto Attendant. The
Voice mail mode
parameter cannot therefore be altered for this system.
•
GSM
Enhanced functionality is achieved for integrated mobile phones by providing
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 receivers – depends on the number of users with integrated mobile
phones who want to use this functionality simultaneously. One
Mobile Phone
Extension
licence is required for each integrated mobile phone.
•
FXO
The basic resources (fixed DSP functions on the call manager card) cover 16 FXO
interfaces. For system configurations with more than 16 FXO interfaces this set-
ting provides additional dialling tone and busy tone receivers.
Note: The values of the user-definable FXO channels corresponds to the
number of FXO interfaces, not the number of additional dialling tone and busy
tone receivers.