_______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com Iphone (AG)                     HFP unit          <----- AT+BRSF=255  -------             // 0xFF => bit 7 (codec negotiation) is on from HFP side          ------ +BRSF:1007  ------->             // 0x3EF => iphone indicates that codec negotiation is on (bit 9)          ------ OK          ------->          <----- AT+BAC=1,2 ---------             // HFP unit informs that cvsd and mSBC are supported          ------ OK          ------->         [etc...] Iphone (AG)                     HFP unit          ------ +BCS:1      -------> // iphone is requesting codec 1, ie CVSD          <----- AT+BCS=1   ---------            // It is mandatory for the HFP unit to accept this codec          ------ OK          ------->         [eSCO link will now open with with CVSD codec]