• 8.5.1. New DCB Conferencing Party Attribute Parameters
• 8.5.2. New DCB Functions

8.5. DCB Audio Conferencing API Enhancements for DM3 Boards

The following DCB API enhancements are supported on DM3 boards only:

• New parameters for the dcb_addtoconf( ), dcb_estconf( ), dcb_getcde( ), and dcb_setcde( ) functions
• Parameters for the dcb_addtoconf( ), dcb_estconf( ), dcb_getcde( ), and dcb_setcde( ) functions
• New functions:
  • dcb_DeleteAllConferences( )
  • dcb_GetAtiBitsEx( )

8.5.1. New DCB Conferencing Party Attribute Parameters

The following party attribute parameters are supported only on DM3 boards for the dcb_addtoconf( ), dcb_estconf( ), dcb_getcde( ), and dcb_setcde( ) functions:

• MSPA_ECHOXCLEN: Enable echo cancellation (default: disabled). The echo cancellation feature supplies 128 tap (16 msec) echo cancellation with the DCB interface. This feature is disabled by default for compatibility with earlier-generation operation. Note that this is a DM3-only feature.
• MSPA_BROADCASTEN: Enable broadcast to all conferees. This parameter sets one party to talk and all others are muted.
• MSPA_MODENULL: Null party. No transmit or receive timeslots (a null party is often used as a placeholder for establishing a conference for a fixed number of parties).
• MSPA_MODERECVONLY: Receive-only party. Conferee participates in conference in receive-only mode (equivalent to MSPA_RO on earlier-generation boards).
• MSPA_MODEXMITONLY: Transmit-only party. Conferee participates in conference in transmit-only mode.
• MSPA_MODEFULLDUPLX: Full Duplex party (conferee may transmit and receive). No special attributes for conferee. Conferee hears everyone except the coach (MSPA_NULL is used for this purpose on earlier-generation boards and may also be used for DM3 boards).

8.5.2. New DCB Functions

The dcb_DeleteAllConferences( ) and dcb_GetAtiBitsEx( ) functions are supported on DM3 boards only. Detailed information on these functions follows.

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