We name inbound call handling the process of answering a call coming from a FXO interface. This section explains the attributes that controls how the gateway handle an inbound call.

The gateway has to replicates the actions performed when a human is answering a call. The CO sent a ringing signal the FXO interface when an inbound call is coming on the interface. Then human ears the phone ringing an may decide to answer immediately or wait few rings before answering the call. The human can also notify someone to answer the phone. The human take off the hook the handset to answer the call. The human can also decide to not answer the call. In such case, the phone rings until the caller decides to drop the call.

When the gateway detects an inbound call on a FXO interface, it does the following actions: