Robotic Audio

[YAARUB F. MILAD]

Hello all ,,

I have a weird VoIP quality Issue  "robotic sound" in our LAN network. it isn't continues nor general because it happens from time to time, in one building and to be more specific one Switch as I was reported that it only occurred on calls where extensions connected to this switch were involved. 

*I checked:

• VAD =off
• hardware errors on switch =none
• AutoQos=configured
• high traffic loads on switch =none

Network Capacity is 100Mbps

[Jaime Valencia]

This is the Video Over IP forum, please move to a relevant area.

[YAARUB F. MILAD]

Sorry , Thought it is voice

[Jonathan Schulenberg]

Look at the call quality statistics on one of those calls. Does it show a degraded MOS score?

If it does, then it's likely a QoS issue. Do you have QoS properly configured to: a) properly trust the phone's COS/DSCP markings; b) the COS to DSCP mapping is accurate; c) COS/DSCP markings on both sides of the uplink port to/from the distribution layer are trusted; and, d) the priority queue is properly configured?

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSCampus_40.html

[Mohammed al Baqari]

Hi,

Not sure what phone model are you using but during active call, double click on the phone help button (?). This will show the call stats.

Please share what you see for jitter and packet loss. It sounds to be QoS problem.

Can you describe your VoIP network as well?