Systems and methods of voice call setup involving mobile devices

A mobile device capable of voice telephony, the method comprising:

• one or more network interfaces capable of interfacing with one or more networks to provide a data communication channel and a voice communication channel;
• and
• a processing resource configured to interface with the one or more network interfaces and to perform a method comprising:
• receiving at the mobile device, an authentication token that can be used to authenticate the mobile device on a voice channel;
• initiating establishment of the voice channel between a telephony system and the mobile device;
• and
• receiving at the mobile device, at least one Dual-tone Multi-frequency (DTMF) tone indicating that information about the mobile device was obtained during the establishment of the voice channel and was matched with an authorized device, and responsively sending, from the mobile device, an acknowledgement DTMF tone.

A non-transitory computer readable medium storing instructions for programming a processor provided with a mobile device to perform a method comprising:

• sending from a calling device, a notification of initiation of a call to be carried on a voice channel, the notification for receipt by a server and comprising information identifying the calling device and a party to be called;
• responsively receiving, an authentication token that can be used to authenticate the calling device to the server;
• initiating establishment of the voice channel between a telephony system and the mobile device;
• and
• receiving, from the server, on the voice channel, at least one Dual-tone Multi-frequency (DTMF) tone indicating that information about the calling device was obtained during the establishment of the voice channel and was matched with the information identifying the calling device contained in the notification, and responsively sending, from the calling device, on the voice channel, an acknowledgement DTMF tone.

A method of providing voice telephony services to a mobile device, the method comprising:

• receiving, at an application server, a notification of a call to involve a mobile device and to be carried on a voice channel;
• sending to the mobile device, over a data channel, an authorization token that can be used to authenticate the mobile device;
• receiving Automatic Number Identification (ANI) information for a call incoming to a telephony system on a voice channel;
• determining whether the received ANI information matches to the mobile device identified in the notification, and responsively sending, on the voice channel, at least one Dual-tone Multi-frequency (DTMF) tone indicating authorization to use an abbreviated authentication procedure comprising sending fewer DTMF tones than a number of tones in the authorization token;
• provisioning a voice channel to the party to be called, for bridging with the voice channel for the incoming call;
• and
• responsive to determining that the received ANI information does not match to the mobile device, indicating to the mobile device to provide the authorization token.