Patent Number: 6,434,151

Title: Communications system and method

Abstract: In a communications system in which narrow band, e.g. voice, channels are carried in packet form over an asynchronous network, each channel is encoded to reduce its bit rate so as to reduce demands on band width. The encoding of each channel is effected via an algorithm selected from a group of algorithms associated with that channel. The algorithms forming the group are identified to a receiver station performing a decoding function via information provided in each packet header. The particular algorithm currently in use is determined implicitly from the packet length or from a combination of the packet length and a discriminator field provided in the packet header.

Inventors: Caves; Keith (Sawbridgeworth, GB), Stacey; David John (Stanstead Abbotts, GB)

Assignee: Nortel Networks Limited

International Classification: H04Q 11/04 (20060101); H04L 12/56 (20060101); H04L 012/28 ()

Expiration Date: 08/13/2019