Mitel Aastra 470 System Manual page 50

Expansion Stages and System Capacity
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
Tab. 18 Required VoIP channels between two possible endpoints
Non-IP endpoint
No VoIP channel
Non-IP endpoint
2 VoIP channels
Non-IP endpoint
No VoIP channel
Non-IP endpoint
Non-IP endpoints:
• Analogue terminal (FXS)
• Digital system terminal (DSI)
• DECT cordless phone (DSI)
• ISDN phone (BRI-S)
• External via analogue exchange (FXO)
• External via ISDN exchange (BRI-T/PRI)
• Internal voice mail system
• Auto attendant
• Internal announcement service
• Music on hold
• Conversation recording
• Queue with announcement
50
1 VoIP channel
Direct switching: No VoIP channel
Indirect switching: 2 VoIP channels
1 VoIP channel
IP endpoints
• IP system phone
• Aastra SIP terminal
• Standard SIP terminal
• DECT cordless phone via SIP-DECT
• WiFi cordless phone via SIP-DECT
• WiFi cordless phone via SIP access point
• WiFi mobile phone via AMC controller
• External via SIP provider
IP endpoints on satellites:
In normal operation all IP endpoints are registered with
the master, even if they are located on the satellite.
Master
IP endpoint
IP endpoint
Satellit
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014