Call completion
Encyclopedia
Call Completion is a telephony
feature allowing some form of alternative interaction between parties who cannot converse directly with each other.
There are several possible factors which can prevent a telephone call
from connecting successfully:
There are various definitions as to what exactly constitutes Call Completion.
Generally speaking, Call-Completion may encompass the following services:
The rationale for providing these features is that allowing some sort of communication between parties unable to talk directly serves both the interests of the callers (allowing them to exchange information despite the inability to talk), as well as the Telecom
operators, as the service allows them to get some return for providing the resources for the call (whereas if the caller simply hangs up, the operators basically have provided the call resources with no return).
Call Completion features can be implemented on a PBX (e.g. Call Hold/ Transfer), dedicated server (e.g. a Voicemail Server)
or directly on the client device (e.g. Messaging applications).
There are several commercial companies which provide Call Completion features, as well as IETF documents specifing Call-Completion features for open standards, such as SIP
.
Telephony
In telecommunications, telephony encompasses the general use of equipment to provide communication over distances, specifically by connecting telephones to each other....
feature allowing some form of alternative interaction between parties who cannot converse directly with each other.
There are several possible factors which can prevent a telephone call
Telephone call
A telephone call is a connection over a telephone network between the calling party and the called party.-Information transmission:A telephone call may carry ordinary voice transmission using a telephone, data transmission when the calling party and called party are using modems, or facsimile...
from connecting successfully:
- Called partyCalled partyThe called party is a person who answers a telephone call. The person who initiates a telephone call is the calling party....
does not answer - Called party is busy in another call
- Called party is offline/unavailable
- Called party actively disconnects the call before answering
There are various definitions as to what exactly constitutes Call Completion.
Generally speaking, Call-Completion may encompass the following services:
- VoicemailVoicemailVoicemail is a computer based system that allows users and subscribers to exchange personal voice messages; to select and deliver voice information; and to process transactions relating to individuals, organizations, products and services, using an ordinary telephone...
- Call transferCall transferA call transfer is a telecommunications mechanism that enables a user to relocate an existing call to another phone or attendant console by using the transfer button and dialing the required location. The transferred call is either announced or unannounced....
- Call waitingCall waitingCall waiting , in telephony, is a feature on some telephone networks. If a calling party places a call to a called party which is otherwise engaged, and the called party has the call waiting feature enabled, the called party is able to suspend the current telephone call and switch to the new...
- Messaging (e.g. SMS, IM)
- Presence notificationPresence informationIn computer and telecommunications networks, presence information is a status indicator that conveys ability and willingness of a potential communication partner—for example a user--to communicate...
- Call Queueing
- Automatic redial
- Text to Speech interaction
The rationale for providing these features is that allowing some sort of communication between parties unable to talk directly serves both the interests of the callers (allowing them to exchange information despite the inability to talk), as well as the Telecom
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
operators, as the service allows them to get some return for providing the resources for the call (whereas if the caller simply hangs up, the operators basically have provided the call resources with no return).
Call Completion features can be implemented on a PBX (e.g. Call Hold/ Transfer), dedicated server (e.g. a Voicemail Server)
or directly on the client device (e.g. Messaging applications).
There are several commercial companies which provide Call Completion features, as well as IETF documents specifing Call-Completion features for open standards, such as SIP
Session Initiation Protocol
The Session Initiation Protocol is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol . The protocol can be used for creating, modifying and terminating two-party or multiparty sessions...
.