The audio quality can easily be monitored in a Yealink device. If your customer experience audio issues, you can activate the monitoring on a Yealink device. Please follow the steps below:

  1. Login into you Yealink device
  2. Go to "Settings" in the top-menu
  3. Go to "Voice monitoring" and set the following options:

Now press "Confirm" and make a test call for at least two minutes. After the test call, you can see the results:

  1. Go to "Settings" in the top-menu
  2. Go to "RTP Status" in the left-menu

Here you can find the following information:

Start TimeThe exact start time of the callEnd TimeThe exact end time of the call
Local userSIP account used for the callRemote userInternal number user
Local IPlocal IP address of the SIP phoneRemote IPThe IP-address from Kwebbl used for the call
Local portlocal port used for the callRemote port
Remote port used for the call
Local CODECLocal CODEC used for the callRemote CODECCODEC used from Kwebbl
Jitterindicating variations in packet arrival time
JitterBufferMaxindicating variations in packet arrival time
PacketlossThe amount of packets lost during the call
The amount of packets lost during the call
Quality score Listener MOS-CQQuality score conversation

Extra information:

Packet Loss - If Packets are lost during a call, the user will hear an audio drop or 'glitch'. In most scenarios the packets are lost in the local network or internet connection from the customer. 

MOS - Mean Opinion Score -  is a measure used to give a call a score. The MOS is expressed as a single rational number, typically in the range 1–5, where 1 is lowest perceived quality, and 5 is the highest perceived quality. VoIP calls often are in the 3.5 to 4.2 MOS range.  The following chart can be used as a guide for VoIP MOS testing and a good comparison for voice quality.

4.3 - 5.0Very satisfied
4.0 - 4.3Satisfied
3.6 - 4.0Some users are satisfied 
3.1 - 3.6Many users dissatisfied
2.6 - 3.1Nearly all users are dissatisfied
1.0 - 2.6All users are dissatisfied