Patent ID: 8406821

Claim:
An in-vehicle hands-free phone system comprising: a base station; a portable terminal that is wirelessly connected to the base station; and an in-vehicle device including: an information acquisition portion that acquires one of network information about a network to which the portable terminal that is currently connected to the in-vehicle device, from the base station via the portable terminal, or service provider information about a service provider of the portable terminal that is currently connected to the in-vehicle device; a storage portion that stores a number sequence whose intermediate portion includes a predetermined code; and a tone sending-out control portion that sends the number sequence stored in the storage portion to the portable terminal and causes the portable terminal to send out the number sequence in a tone, wherein the tone sending-out control portion determines a tone sending-out behavior about a number sequence part that is subsequent to the predetermined code based on one of the network information acquired by the information acquisition portion or the service provider information acquired by the information acquisition portion.