FAQ Maxwell Basic / 2 / 3: RTCP XR parameter description.

Parameter		Description	Quality
PacketLoss: NLR	Net packet Loss Ratio	The fraction of RTP data packets from the source lost since the beginning of reception.	The lower the better is the quality.
PacketLoss: JDR	Jitter buffer Discard Ratio
Jitter Buffer: JBA	Jitter Buffer Adaptive	3 = Adaptive Jitter buffer is used (Default setting Maxwell)
Jitter Buffer: JBN	Jitter Buffer Nominal	Current nominal jitter buffer delay in milliseconds.	The lower the better is the quality.
Jitter Buffer: JBM	Jitter Buffer Max	Current maximum jitter buffer delay in milliseconds (in this case, the adaptive jitter buffer is used).	The lower the better is the quality.
Jitter Buffer: JBX	Jitter Buffer Abs Maximum	This delay is the absolute maximum in milliseconds that the adaptive jitter buffer can reach under worst-case conditions. it is the Maximum default value of the Jitter buffer settings. (400 ms, default setting Maxwell)
QualityEst: MOSCQ	Conversation Quality		Maxiumum for G.711 codec		4.4
QualityEst: MOSLQ	Listening Quality		Excellent	4.3	5.0
			Good	4.0	4.3
			Some satisfied	3.6	4.0
			Many dissatisfied	3.1	3.6
			All dissatisfied	2.6	3.1
			Very bad	1.0	2.6

What can influence the call quality:

Jitter (Variation in packet Latency)
Packet Loss (Packets being dropped because of too much traffic, router issues, defect hardware and many more)
Latency (The time between the package is send and received)
Hardware
Codec (Non compressed codecs like G711 will give the best voice quality. Compressed codecs like G729 can quickly degrade.)
Bandwidth (Low bandwidth or not enough bandwidth can cause packages having high Latency/Jitter and packages being dropped, with quality of service you can ensure that enough bandwidth is available for VoIP calls.)

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