No Audio for the first 5 seconds

• Network Congestion
• Delays due to push notifications on the App, when you have a Welcome message

Slow Internet connection

If you are consistently experiencing choppy and/or garbled sound, chances are that your internet connection speed is insufficient. An HD VoIP call uses about 0.1 Mbit/sec of bandwidth. As a rule of thumb, it is wise to have at least double the amount of capacity available at any time per concurrent call. E.g: If a maximum of three colleagues are on the phone at any given time, you should have at least 0.1 x 3 x 2 = 0.6 Mbit/sec of upload speed AND download speed fully dedicated to VoIP. This is in addition to the data consumed by other devices on your network, such as PC’s.

To get a snapshot and indication of your real connection speed – not the speed that your internet provider has promised you – do a speedtest. To get a good idea of consistent speed, do a few tests at different points of the day and days of the week. Especially when everybody is in the office and you are experiencing slow internet and/or call quality issues.

Solution:

• Upgrade your internet connection. Make sure you have plenty of spare capacity. Faster is always better.
• Even better, split VoIP data from computer data: get a separate connection for VoIP.
• Use a higher compression technique for your calls. (The G729 codec instead of G711a)

Flooded Internet connection

Even if your internet connection is providing sufficient bandwidth, you might still experience call quality issues due to the fact that other devices are consuming all the data, leaving too little spare capacity for voice data packets to be transmitted and received efficiently and effectively.

Solution:

• Ask your colleagues to upload and download large files when you are not on the phone.
• Switch off or limit the speed of applications that synchronize large files, such as Dropbox and Google Drive. Even the fastest connections can get flooded quickly.
• Set QOS (Quality of Service) on your router and prioritize VoIP traffic, this can be done on your deskphone like Yealink as well.
• Upgrade your internet connection. Faster is always better. Keep plenty of spare capacity.
• Split VoIP data from computer data: get a separate connection for VoIP.