More examples in Network Design/Network Diagrams
Airport IP Telephony Network (Cisco) Network Diagram Example
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Text in this example:
Cisco Systems Airport IP
Telephony network
Processing
System
PSTN
Existing
Airline
PBX
Airline 2
PBX
Call Managers
Telephony network
Processing
System
PSTN
Existing
Airline
PBX
Airline 2
PBX
Call Managers