Voice delay/lag during Skype for business meetings


#1

Dear support team,

I have issues with our new GAC2500 conferencing phone and the Android Skype for business application.

I downloaded the latest version of the Skype for business application from the Google play store and also updated the GAC2500 firmware to the more recent version.

We noticed a delay or lag (between 2 and 5 seconds) during Skype for business meetings, this lag or delay is so important that attending a meeting is quite impossible for any participant: basically people in the meeting room are almost talking at the same time as users connected to the Skype meeting.

The phone is connected directly to a 24 ports gigabit switch, we are not using Wifi at all.

I tried changing the audio options without any luck, could you help me solve this issue?

Antoine Nowak.


#2

Hi think you may want to check

  1. latency
  2. jitter although this with casue a more kind of grablled voice
  3. are you using fiber , LTE , ADSL .
  4. is it a converged network voice and data
  5. if converged do you have any type of QOS
  6. are you using any vlan trunking if so do you have layer 2 qos set up 802.1q

This is a not so much a problem with hardware but more a problem of network congestion
Sorry unbale to proivde you with any kind of direct solution but by checking the above you may be able to improve your issue.


#3

Hi,

Thanks for your reply!

I will check this and let you know.

We have a new fiber connection and for now only the GAC2500 has been connected to our new switch (Microtik CSS326-24G-2S+RM), it is a converged network voice and data.

Our previous fiber connection is still up so I will test as well with the phone, we are using Cisco switches with this particular one.

Nothing has been configured regarding QOS with this switch yet.

For your information I just download the MS Teams app on the phone and made some tests, we also have the same voice delays as with Skype for business.

I also tested our regular VoIP system and no voice delay so far.

I will check with our network provider what can be done regarding jitter.

Antoine.