The device calculated and reported the jitter as measured in the stream of RTP (Real-Time Transport Protocol) packets that carry the voice. It also reported the jitter calculation made by the called phone. This value appeared in an RTCP (Real-Time Control Protocol) report sent by the called phone to the calling phone. In the past, many test products reported only one of these two values.
By measuring both types of jitter, the device helps the technician locate the switching device or segment that's contributing to the problem. RTCP jitter is calculated by the called phone and reported back to the calling phone. NetTool calculates jitter based on its own internal clock at the point at which the measurement is taken.
When NetTool is close to the calling phone, the calculated jitter is close to zero. As the technician moves away from the calling phone and toward the called phone, calculated jitter increases. Eventually it should match the value reported in the RTCP report generated by the called phone. At any point where the calculated jitter value increases significantly, a device or link is making a substantial contribution to the jitter effect.
3 Environments, 3 Protocols
We tested the NetTool device with systems from three major VoIP vendors--Avaya, Cisco and Vonage. These companies implement the three key call setup protocols, respectively: H.323, SCCP (Signaling Connection Control Point, aka Skinny), and SIP (Session Initiation Protocol).
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