1. A method of increasing the intelligibility of a communication session between a first participant and a second participant, comprising: receiving a voice signal from the first participant; determining, by a communication device, at least one speech style characteristic of the first participant; assigning, based upon determining the at least one speech style characteristic of the first participant, the first participant to a first accent group having a first set of speech and listening style characteristics; determining at least one listening style characteristic of the second participant; assigning, based upon determining the at least one listening style characteristic of the second participant, the second participant to a second accent group having a second set of speech and listening style characteristics; determining a difference between the first set of speech and listening style characteristics and the second set of speech and listening style characteristics; and based on the determined difference, performing at least one of the following: (i) adjusting at least one property of at least one portion of the voice signal and transmitting the adjusted voice signal to the second participant; and (ii) maintaining original properties of at least a portion of the voice signal and transmitting the voice signal to the second participant.