Mitel 470 System Manual page 50

Expansion Stages and System Capacity
Tab. 17 DSP modules
Type
SM-DSPX1
SM-DSPX2
1)
SM-DSP1
1)
SM-DSP2
1) Although no longer available, the module is still supported.
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 and DSP chip on Call Manager card CPU1. For this the DSP chips have to be
loaded with different firmware. The additional meadia resources can be used for DECT
telephony, Voice over IP, fax transmissions, audio services, integrated mobile/external
phones, additional dial tone and busy tone recipients on many analogue network inter-
faces FXO or for CAS (signalling protocol for PRI network interface in certain coun-
tries). 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 70).
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-
50
Number of DSP chips per module
1
2
1
2
Max. number of modules per system
Media resources (
2
=ym) view.
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016