3 the mutual context of these two events assures the service provider that this is the expected command and that these dtmf signals are not intended for any other dtmf driven system on the call appropriately selected the spoken words in the commands would have sufficient phonetic information to be a easily recognized and b easily distinguished from each other independent of the speaker 39 s diction or network transmission characteristics using the service provider 39 s name e g at amp t mci sprint and or qwest as the spoken part of the command reinforces the user 39 s association with the brand in addition using the service provider 39 s name as the keyword also easily distinguishes whose services are being requested during a call crossing multiple service providers 39 jurisdictions e g spanning local interexchange and international carriers from the users 39 perspective one or two dtmf tones and one or two spoken words are easy to remember as a command set in accordance with the present invention users can then benefit from menu driven access to all of the features offered by their service provider dtmf tones can be used during the detailed feature selection phase while any other dtmf driven devices are shielded from confusion about the purpose of those tones the service provider may predetermine the exact ordering of the keyword s and the dtmf tone s and informs their customers appropriate equipment on the network recognizes the command when the tones and words are detected in the correct order within a predefined time limit a location within.