Mitel 430 System Manual page 45

Compared with DSP modules, modules with the designation DSPX are fitted with more
powerful DSP chips. They are used to transmit VoIP data among others using the
SRTP protocol (Secure VoIP).
Allocatable functions
One or more functions can be allocated to the individual DSP chips on the DSP mod-
ules. For this the DSP chips have to be loaded with different firmware. The additional
media resources can be used for DECT telephony, Voice over IP, fax transmissions,
audio services, integrated mobile/external phones or for remote maintenance via mo-
dem. This means that for each DSP chip a specific number of channels is available for
the corresponding functions. Some of these functions are subject to a licence (see also
"Licences", page 62).
Functions are allocated in WebAdminin the
• DECT
Operation of a DECT system on DSI interfaces with cordless phones. The voice
data must be transformed on connections between DECT and non-DECT end-
points. This process requires DSP capacity.
Purely DECT-DECT connections set up already do not require any media re-
sources. On the other hand, media resources are required to set up connections.
DECT channels can be used without a licence.
• VoIP
Connections between IP and non-IP endpoints are made via an IP media gateway.
This is carry out by the integrated standard media switch that switches VoIP chan-
nels for call connections in the IP network. The Standard Media Switch uses media
resources for the real-time processing of the call data. VoIP channels are always re-
quired 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 chan-
nels are also used for call connections between the nodes (see "Use of VoIP chan-
nels", page 46 for an overview).
The number of configurable VoIP channels depends on both the type of DSP chip
(see "Configuration of DSP chips", page 49) and the configured mode (see "Stand-
ard Media Switch modes of operation", page 48).
If the VoIP mode is set to G.711, two G.711 VoIP channels per system can be used
without a licence. One
for each additional VoIP channel.
• 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
Mitel 415/430 as of R4.1
syd-0580/1.2 – R4.1 – 08.2016
Expansion Stages and System Capacity
Media resources
VoIP Channels for Standard Media Switch
( =ym) view.
licence is required
45