Parameter
DescriptionQuality

PacketLoss: NLRNet packet Loss RatioThe fraction of RTP data packets from the source lost since the beginning of reception.The lower the better is the quality.

PacketLoss: JDRJitter buffer Discard Ratio



Jitter Buffer: JBAJitter Buffer Adaptive3 = Adaptive Jitter buffer is used (Default setting Maxwell)


Jitter Buffer: JBNJitter Buffer Nominal Current nominal jitter buffer delay in milliseconds.The lower the better is the quality.

Jitter Buffer: JBMJitter 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: JBXJitter Buffer Abs MaximumThis 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: MOSCQConversation Quality

Maxiumum for G.711 codec


4.4
QualityEst: MOSLQListening QualityExcellent4.35.0


Good4.04.3
Some satisfied3.64.0
Many dissatisfied3.13.6
All dissatisfied2.63.1
Very bad1.02.6


What can influence the call quality:

  1. Jitter (Variation in packet Latency)
  2. Packet Loss (Packets being dropped because of too much traffic, router issues, defect hardware and many more)
  3. Latency (The time between the package is send and received)
  4. Hardware
  5. Codec (Non compressed codecs like G711 will give the best voice quality. Compressed codecs like G729 can quickly degrade.)
  6. 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.)


Examples Maxwell device in Network where we changed the Bandwidth to see the influence on the Voice quality:
BandwidthG711 codec usedG729 codec used
Unlimited

SessionDesc: PT=8 PD=PCMA SR=8000 FD=20 FO=160 PPS=50 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=20 JBM=50 JBX=400\n
PacketLoss: NLR=0 JDR=0\n
BurstGapLoss: BLD=0 BD=0 GLD=0 GD=3551 GMIN=16\n
Delay: RTD=0 ESD=112 SOWD=56\n
Signal: SL=-13 NL=-56 RERL=-13\n
QualityEst: RLQ=86 RCQ=86 MOSCQ=4.2 MOSLQ=4.2\n

SessionDesc: PT=18 PD=G729 SR=8000 FD=20 FO=20 PPS=49 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=20 JBM=50 JBX=400\n
PacketLoss: NLR=0 JDR=0\n
BurstGapLoss: BLD=0 BD=0 GLD=0 GD=12940 GMIN=16\n
Delay: RTD=0 ESD=102 SOWD=51\n
Signal: SL=-21 NL=-50 RERL=-21\n
QualityEst: RLQ=76 RCQ=76 MOSCQ=3.8 MOSLQ=3.8\n

100 Kbps

SessionDesc: PT=8 PD=PCMA SR=8000 FD=20 FO=160 PPS=49 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=20 JBM=370 JBX=400\n
PacketLoss: NLR=5 JDR=0\n
BurstGapLoss: BLD=24 BD=88 GLD=0 GD=3388 GMIN=16\n
Delay: RTD=0 ESD=138 SOWD=69\n
Signal: SL=-21 NL=-56 RERL=-21\n
QualityEst: RLQ=78 RCQ=77 MOSCQ=3.8 MOSLQ=3.8\n

See unlimited
80 Kbps

SessionDesc: PT=8 PD=PCMA SR=8000 FD=20 FO=160 PPS=49 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=20 JBM=120 JBX=400\n
PacketLoss: NLR=15 JDR=0\n
BurstGapLoss: BLD=103 BD=520 GLD=1 GD=2734 GMIN=16\n
Delay: RTD=0 ESD=95 SOWD=47\n
Signal: SL=-22 NL=-45 RERL=-22\n
QualityEst: RLQ=65 RCQ=65 MOSCQ=3.3 MOSLQ=3.3\n

See unlimited
50 Kbps

SessionDesc: PT=8 PD=PCMA SR=8000 FD=20 FO=160 PPS=49 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=20 JBM=230 JBX=400\n
PacketLoss: NLR=108 JDR=0\n
BurstGapLoss: BLD=110 BD=3377 GLD=0 GD=72 GMIN=16\n
Delay: RTD=0 ESD=116 SOWD=58\n
Signal: SL=-18 NL=-54 RERL=-18\n
QualityEst: RLQ=21 RCQ=21 MOSCQ=1.2 MOSLQ=1.2\n

SessionDesc: PT=18 PD=G729 SR=8000 FD=20 FO=20 PPS=49 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=20 JBM=50 JBX=400\n
PacketLoss: NLR=0 JDR=0\n
BurstGapLoss: BLD=0 BD=0 GLD=0 GD=13520 GMIN=16\n
Delay: RTD=0 ESD=103 SOWD=51\n
Signal: SL=-23 NL=-64 RERL=-23\n
QualityEst: RLQ=76 RCQ=76 MOSCQ=3.8 MOSLQ=3.8\n

20 KbpsN.A.

SessionDesc: PT=18 PD=G729 SR=8000 FD=20 FO=20 PPS=49 FMTP="annexb=no" PLC=2 SSUP=off\n
JitterBuffer: JBA=3 JBR=12 JBN=17 JBM=100 JBX=400\n
PacketLoss: NLR=89 JDR=0\n
BurstGapLoss: BLD=91 BD=11485 GLD=0 GD=788 GMIN=16\n
Delay: RTD=0 ESD=95 SOWD=47\n
Signal: SL=-18 NL=-35 RERL=-18\n
QualityEst: RLQ=17 RCQ=17 MOSCQ=1.3 MOSLQ=1.3\n

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