Motorola Corporation

Symbol Technologies, LLC

Yi-Cheng Liu

Edgardo L Promenzio

Ajaykumar R Idnani

Rajendra A Panchal

Soren K Lundsgaard

Douglas A Kuhlman

Jorge R Lopez Danieluk

Patrick Stephen

Greg Dykes

Richard Joyner

A method and system for secure call Dual-Tone Multi-Frequency (DTMF) signaling includes entering () dial string of a telephone number of a destination device, assigning () the dial string to a predefined string having a total length that is greater than the dial string such that there will be at least one leading hexadecimal bit in the predefined string length that is not used when the entered dial string is converted to a hexadecimal, converting () the dial string to hexadecimal, reversing the order of the hexadecimal, and placing the reversed hexadecimal at the beginning of the predefined string, appending () 'one' bits to the predefined string length indicating how many nibbles of the predefined string length are unused, if any, and appending the remaining intervening unused bits in the predefined string length to 'zero' bits, and sending () the encoded string length.

Secure call DTMF signaling

Devices that are enabled to communicate with each other via an ad hoc conference mode and an infrastructure supported conference mode, are provided with processing capabilities that can allow them to evaluate one or more resources required to support an ad hoc conference communication session and/or one or more quality metrics associated with the ad hoc conference communication session, and determine whether one or more resources or metrics are outside optimal operating parameters. If so, the processing logic can initiate a transition from the ad hoc conference communication session to an infrastructure supported conference communication session hosted at a conference server. This way, the devices can drop the ad hoc conference communication session when one or more of the resources or metrics are outside optimal operating parameters, so that one of the devices does not need to mix communication information streams (CISs) from the devices, generate a plurality of conferenced communication information streams (CCISs), and transmit a unique one of the conferenced communication information streams (CCISs) to the other devices.

Methods and apparatus for selecting between an ad-hoc conference mode and an infrastructure supported conference mode

During a communication session () for a multi-network user platform (which communication session is presently occurring in a first network and is terminable by a Session Initiation Protocol server as comprises a part of that first network), one establishes () in the first network a Session Initiation Protocol instance as corresponds to the communication session. Thereafter, and particularly following a handoff of the communication session from the first network to a second network, one uses () the Session Initiation Protocol instance to maintain communications with the Session Initiation Protocol server such that the Session Initiation Protocol server does not terminate the communication session.

Method and apparatus to facilitate persistence of a handed-off communication system

During () a communication session for a plurality of user platforms wherein at least one of the user platforms is on hold and wherein the communication session is presently occurring in a first network and is terminable by a Session Initiation Protocol server as comprises a part of that first network, one establishes () in the first network a Session Initiation Protocol instance as corresponds to the communication session wherein the Session Initiation Protocol instance comprises, at least in part, session context information for the user platform that is on hold. Then, following a handoff of bearer support of the communication session from the first network to a second network, one uses () the Session Initiation Protocol instance to maintain the hold status of the user platform that is on hold with the Session Initiation Protocol server subsequent to the handoff such that the Session Initiation Protocol server does not terminate the communication session.

Method and apparatus to facilitate use of a session initiation protocol instance to support on-hold session status

Growing community of inventors

Barrington, IL, United States of America

Yi-Cheng Liu