When a call comes from the PSTN, the call is answered by a PSTN line device. During initialization, the PSTN channel was associated with a specific IP line device, so the call is connected to the IP line device that is associated with this PSTN line device.
When a call arrives from the IP network, there is no direct association of a channel, since there are no individual physical connections for the IP channels. The call is answered by a line device. During initialization, the line device was associated with a specific PSTN line device. The Global Call API tells the IP Gateway (Global Call) demo which PSTN channel is associated with this IP channel. The application then connects the IP call to the appropriate PSTN channel.
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