Relationships

Voice telephony is a common element shared by these three profiles, but from a technical perspective (refer back to Figure 11.1) they inherit from two different profile families. The cordless telephony and intercom profiles are part of (and indeed all of) the TCS-BIN family (even though there is no TCS-BIN profile per se) while the headset profile derives from the serial port profile. Yet from an end user's perspective, the most visible feature of all of these profiles is the ability to route and process telephony-grade audio traffic using Bluetooth wireless communication.

The cordless telephony and intercom profiles are both part of the three-in-one phone usage case. Recall from Chapter 3 that the three types of usage for a mobile telephone in this scenario are as (1) a standard cellular phone; (2) an intercom or "walkie-talkie"; and (3) a cordless phone using a cordless base station, or voice access point. Standard cellular phone operation is addressed by protocols like GSM, CDMA, CDPD and others, using a wide area radio in the handset; Bluetooth wireless communication is not used for the standard cellular phone operation. Standard cellular phone usage is not discussed further.