Call Accept, Reject, and Redirect

In environments like ISDN, call offering is separate from alerting. In fact, after a call has been offered to an application, a time window exists during which the application has a number of options:

• It can immediately answer the call using lineAnswer.
• It can accept the call using lineAccept, which initiates alerting to both the caller (as ringback) and the called party (as ring).
• It can reject the offering call using lineDrop, which reverts the offering call to the idle state.
• It can redirect the call using lineRedirect, which deflects the offering call to another address. The call reverts to the idle state.