We've identified an issue in some Grandstream phones that can cause intermittent call quality or audio distortion (at the phone level) on the user's end of the call. The issue is caused by the phone's jitter buffer settings not accurately managing the packets sent from our servers.
If you are experiencing this issue, please follow the steps below:
1 - Login to the phone's web interface via it's IP Address in your web browser. (IP can be found by pressing UP arrow.)
2 - Under Accounts, Account 1, Audio Settings find and change the following:
- Jitter Buffer Type: Fixed
- Jitter Buffer Length: 400ms
3 - At the bottom, choose Save and Apply.