_______________________________________________ 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]