3.2.2 Basic Call States at the Outbound Interface

The basic outbound call states are as follows:

Null state (GCST_NULL)

This state indicates that no call is assigned to the channel (time slot or line). This is the initial state of a channel when it is first opened. This state is also reached when a call is released or after the channel is reset. The channel in this state is available for making outbound calls.

Call Dialing (GCST_DIALING)

This state exists for an outgoing call when an outbound call request is made. The call signaling or message is in the process of being prepared for transfer or being transferred across the telephony network (overlap sending or partial dialing). In response, the remote side may request more information, acknowledge the call, accept the call or answer the call.

Send More Information (GCST_SENDMOREINFO)

This state exists for an outgoing call when the user has received an acknowledgement of the call establishment request that permits or requests the user to send additional call information to the network in overlap mode. The information, typically digits, is in the process of being prepared for transfer or being transferred across the telephony network (overlap sending or partial dialing). (This state is optional and may not be supported in all technologies. See the appropriate Global Call Technology User's Guide for information.)

Call Proceeding (GCST_PROCEEDING)

This state exists for an outgoing call when the user has received an acknowledgement that all call information necessary to effect call establishment has been received and the call is proceeding. The remote side can now accept or answer the call. (This state is optional and may not be supported in all technologies. See the appropriate Global Call Technology User's Guide for information.)

Call Alerting (GCST_ALERTING)

This state exists for an outgoing call when the calling user has received an indication that remote user alerting has been initiated, typically ringing. The outbound call has been delivered to the remote party, which has not yet answered the call.

Call Connected (GCST_CONNECTED)

This is a common state that exists for an outgoing call when the user has received an indication that the remote user has answered the call. The calling and called parties are connected and the call is therefore active on the related call channel.

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