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E
XPANSION WITH CARDS AND MODULES
CHAPTER 3 EXPANSION STAGES AND SYSTEM CAPACITY
data. VoIP channels are always required between IP and non-IP endpoints, e.g. for internal connec-
tions 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
for an overview).
The number of configurable VoIP channels depends on both the type of DSP chip (see Configura-
tion of DSP chips) and the configured mode (see Standard Media Switch modes of operation).
If the VoIP mode is set to G.711, two G.711 VoIP channels per system can be used without a licence.
One VoIP Channels for Standard Media Switch licence is required 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 are not separately licensed. Systems just need an appropriate number of VoIP channels. .
• Audio services
The audio 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. Licences (Enterprise Voice
Mail, Audio Record amp; Play Channels, Auto Attendant) and media resources are required for this.
Audio channels can be used for voice mail, auto attendant, queue with announcement, call record-
ing, announcement with audio file, or conference bridge. The allocation is configurable (see Con-
figuration of DSP chips). Announcement service and music on hold use their own resources.
NOTE: On the Mitel SMBC communication server G.711 audio channels are always used for audio services.
The Voice mail mode parameter can therefore not be changed for this system.
• GSM
Enhanced functionality is achieved for integrated mobile/external 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/external phones who want to use this functionality simultaneously.
One Mobile or External Phone Extension licence is required for each integrated mobile/external
phone.
• CAS
CAS (Channel-associated signaling) is a signalling protocol for PRI-E1 network interfaces used in cer-
tain countries (e.g. Brazil). This setting provides the tone sender and receiver for transmitting sig-
nalling 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.
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