Cisco Cisco Customer Voice Portal 8.0(1)
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Cisco Internet Service Node (ISN) Product Description
OL-1250-03
Chapter 1 Introduction
Sample ISN Call Flows
ISN IP Transfer
shows an ISN IP transfer scenario.
Figure 1-16 ISN IP Transfer
The call routing flow in
is as follows:
1.
The NAM/ICM makes a routing decision based on call context or by executing scripts. Once the
NAM knows the terminating destination for the call, it sends call routing instructions to the
Application Server.
NAM knows the terminating destination for the call, it sends call routing instructions to the
Application Server.
2.
The Application Server generates a VXML page with instructions and sends it to the Voice Browser.
3.
The Voice Browser conducts a lookup in its Gatekeeper to determine the IP address of where to send
the call.
the call.
4.
Voice Browser tells the originating Gateway to break down the existing packetized voice stream.
5.
Voice Browser instructs the Ingress Gateway to set up a new packetized voice stream to the Egress
Gateway or Call Manager.
Gateway or Call Manager.
6.
Meanwhile, the Voice Browser retains signaling control over the Ingress Gateway and new Egress
Gateway, using the H245 signaling channel.
Gateway, using the H245 signaling channel.
Note
The processes described in Steps 4-6 use the H245 Empty Capability Set feature. This is a
mechanism the Voice Browser uses to tear down a RTP stream and cause it to be redirected
somewhere else.
mechanism the Voice Browser uses to tear down a RTP stream and cause it to be redirected
somewhere else.