
156 Chapter 9 VoIP trunk gateways
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Call process
Based on Figure 46, this is how the call would progress:
1 A home-based employee in Santa Clara wants to call someone in Ottawa, so they dial into the
local BCM network using the access code for an unsupervised trunk (not VoIP trunks) and the
destination code and DN for the person they want to reach on System B.
2 When the call is received from the public network at System A (Santa Clara), the system
recognizes that the received number is not a local system number. The call is received as a
public call.
3 System A has a route and destination code that recognizes the received number and destination
code as belonging to the route that goes to System B (Ottawa). System A passes the call to
System B over a dedicated trunk, in this case, a VoIP trunk. This call is now designated as a
private call type.
4 System B recognizes the code as its own, and uses a local target line to route the call to the
correct telephone.
Dialin:
XXX-2244
Ottawa
Dialout:
2244
Gateway: 3
dedicated VoIP trunk private network
DN 2244
Target line XXX recognizes 2244
DN 2244 assigned with target
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