1. A system designed and operable to analyze communication sessions conducted over a network, wherein the communication sessions progress in a transactional manner, the system comprising: a capture module operable to receive a transaction signature composed of a plurality of transaction elements, wherein the transaction signature is characteristic of a communication transaction; a signature formation module operable to utilize transaction elements received by the capture module to create signatures associated with the communication transaction; a memory operable to store at least one previously identified transaction signature pattern; a signature recognition module operable to determine whether the received transaction signature corresponds to a previously identified transaction signature pattern; and a classification module operable to, if the received transaction signature does not correspond to a previously identified transaction signature pattern, create a new transaction signature pattern, and classify the new transaction signature pattern as one of a plurality of classifications indicative of completion or failure of the communication transaction, wherein the transaction signature is selected from a group consisting of a start line signature composed of a combination of start line words in SIP messages, a header signature composed of a combination of header messages; a parameter signature composed of one or more parameters, and a Session Description Protocol (SDP) parameter signature.