Patent ID: 9019839
Filing Date: 2015-04-28
Classification: H04L

Abstract:
1. An apparatus for measuring Quality of Service (QoS) of Fax over Internet Protocol (FoIP) calls, the apparatus comprising: a FoIP packet monitoring module, that is connected along a FoIP route between a FoIP emitter device and a FoIP receiver device, and that is external to said FoIP emitter device and is external to said FoIP receiver device, to monitor in real-time and in two communication directions, and externally to said FoIP emitter device and FoIP receiver device, Internet Protocol (IP) network streams of T.38 packets that are exchanged over an IP network in a first communication direction from said FoIP emitter device to said FoIP receiver device and also in a second communication direction from said FoIP receiver device to said FoIP emitter device, wherein the FoIP packet monitoring module is to detect FoIP call problems and to diagnose sources of said FoIP call problems, externally to said FoIP emitter and FoIP receiver devices, along said FoIP route between the FoIP emitter device and the FoIP receiver device, by monitoring (a) FoIP T.30 control streams transferred over T.38 protocol along said FoIP communication route in said first communication direction and (b) FoIP T.30 control streams transferred over T.38 protocol along said FoIP communication route in said second communication direction; wherein the FoIP packet monitoring module is to measure QoS of FoIP calls and to diagnose source reasons of fax image rejections, along said FoIP communication route, and externally to said FoIP emitter and FoIP receiver devices, by (A) checking contents of FoIP T.30 post-message response frames that are transferred over T.38 protocol along said FoIP communication route in said second communication direction, and by (B) checking data errors of FoIP fax image streams transferred over T.38 protocol along said FoIP communication route in said first communication direction; wherein the FoIP racket monitoring module is to detect, based on real-time monitoring of FoIP packets exchanged over said IP network, numbers of fax pages transferred during a T.38 fax call as digital FoIP packets over said IP network between said FoIP emitter device and said FoIP receiver device; wherein said numbers of fax pages transferred, that are detected by the FoIP packet monitoring module based on real-time monitoring of digital FoIP packets, include at least two numbers which comprise a total number of fax pages transferred, and a number of fax pages transferred at maximal fax rate.