“The attribute “SupportedFeatures” states the features supported in each device. … The set of features supported in each case is bit-wise defined in this attribute on a yes/no basis. The mapping between the features and their corresponding bits within the attribute is listed below in for the HF and in for the AG. …

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Bit     Feature                                                     Default in HF
(0=LSB)
0       EC and/or NR function (yes/no, 1 = yes, 0 = no)             0
1       Call waiting and three way calling(yes/no, 1 = yes, 0 = no) 0
2       CLI presentation capability (yes/no, 1 = yes, 0 = no)       0
3       Voice recognition activation (yes/no, 1= yes, 0 = no)       0
4       Remote volume control (yes/no, 1 = yes, 0 = no)             0

Table 5.2 “SupportedFeatures” attribute bit mapping for the HF

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Bit     Feature                                             Default in AG
(0=LSB)
0       Three-way calling (yes/no, 1 = yes, 0 = no)         1
1       EC and/or NR function (yes/no, 1 = yes, 0 = no)     0
2       Voice recognition function (yes/no, 1 = yes, 0 = no)    0
3       In-band ring tone capability (yes/no, 1 = yes, 0 = no)  1
4       Attach a phone number to a voice tag (yes/no, 1 = yes, 0 = no)  0