Patent ID: 7752449
Filing Date: 2010-07-06
Classification: G06F,H04L

Abstract:
1. A method, in a public switched telephone network (PSTN), for generating an authenticated record of a communications data stream comprising: receiving, via the PSTN, a data signal representing authentication information associated with the communications data stream; capturing, at a node of the PSTN, a data signal representing the communications data stream; segmenting the data stream into defined frames; for each m frames, generating a key frame containing integrity information associated with said m frames, and authentication information associated with the communications data stream; inserting said key frame as an m+1th frame into the segmented data stream after m frames of the data stream; and generating a data signal representing the authenticated record of the communications data stream, the authenticated record including the communications data stream and the key frame; wherein the communications data stream is generated by copying pulse code modulation (PCM) data from time division multiplex (TDM) frames.