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Bearer Mode

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The bearer mode corresponds to the quality of transmission requested from the network for establishing a call. It is important to keep the concept of bearer mode separate from that of media type. As an example, the analog telephone network (PSTN) provides only a 3.1 kHz voice-grade bearer mode but calls using it can support media types such as voice, fax, or data modem.

The bearer mode of a call is specified when the call is set up, or is provided when the call is offered. With line devices able to represent channel pools, it is possible for a service provider to allow calls to be established with wider bandwidth.

Not all service providers support use of this information.

TAPI 2.x: See lineSetCallParams, lineGetCallInfo, dwBearerMode member of LINECALLINFO.

TAPI 3.x: See ITCallInfo::get_CallInfoLong, ITCallInfo::put_CallInfoLong, CIL_BEARERMODE member of CALLINFO_LONG.

TSPI: See LINE_CALLINFO message, with dwParam1 set to LINECALLINFOSTATE_BEARERMODE.