Expansion Stages and System Capacity
• CAS
CAS (Channel-associated signaling) is a signalling protocol for PRI-E1 network interfaces used in
certain countries (e.g. Brazil). This setting provides the tone sender and receiver for transmitting
signalling 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.
Table 16: Required VoIP channels between two possible endpoints
Release 7.1
System Manual for Mitel SMB Controller 48
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