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Chapter 13. The Telephony Profiles > The Cordless Telephony Profile

The Cordless Telephony Profile

As already noted, the cordless telephony profile, or CTP, defines the "cordless phone" facet of the three-in-one phone usage case, but more generically it defines cordless telephony. The CTP not only allows a cellular telephone to use Bluetooth technology for short-range wireless voice communication, but it also addresses handsets that exclusively use Bluetooth wireless communication to act only as cordless telephones. These telephones are not cellular phones; they are solely cordless handsets for use with a local base station. The CTP also includes computers that could accomplish cordless telephony using Bluetooth wireless communication, through support for the TCS-BIN protocol and audio traffic management using the microphone and speakers of the computer.

The cordless telephony usage scenario drove most of the requirements for the Bluetooth telephony control protocol. Cordless telephony introduces the notion of terminal devices and gateway devices and hence the requirement for control functions for these devices, such as group management. Furthermore, cordless telephony also introduces the need for reasonably sophisticated call control functions. For example, a base station needs to communicate call control information to and from a remote handset to enable the handset to receive ring tones for incoming calls and to dial through the base station for outgoing calls. Finally, advanced features found on many existing cordless telephones, like multiple handsets for a single base station, speed dialing, directory and caller identification information and so on drive the expectation that these same sorts of features can be accommodated in Bluetooth cordless telephony. Thus the functions required for cordless telephony helped to drive the selection of TCS-BIN, which is the primary protocol used by the CTP (recall from Chapter 10 that TCS-BIN provides call control, group management and connectionless TCS functions, all of which are important in satisfying the requirements outlined above).


  

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