Patent ID: 8295816
Filing Date: 2012-10-23
Classification: H04M,H04W

Abstract:
1. A connection method for use by a vehicle telematics unit to establish a wireless telephone connection between the telematics unit and a call center, comprising the steps of: (a) attempting origination of a voice channel cellular connection between the telematics unit and call center using one or more connection methods; wherein step (a) further comprises attempting origination of the voice channel cellular call using a plurality of different connection strategies attempted serially until either the origination is successful or all of the connection strategies have been attempted without the origination being successful; (b) establishing a modem data connection between the telematics unit and call center if the origination is successful; and (c) if the origination is unsuccessful, then attempting origination of a voice channel cellular connection for communication of speech between the telematics unit and call center using a base station to which the telematics unit has previously successfully attached; wherein, if the attempted origination in step (c) is unsuccessful, then the method further comprises the step of carrying out a connection strategy involving attempted origination of a voice channel cellular call over any of a number of available base stations using a manual network selection mode.