Fix Audio Issues on Impact Phone

Many audio issues when using Impact Phone for Windows, Android and iOS are most often caused by using the wrong audio codecs and/or missing STUN server.

Instructions

Codecs:

Impact Phone for Windows

Go to “…” > Preferences > Audio. Deactivate all codecs except PCMU, PCMA, G.722, GSM as shown in the example below and move them to the top of the list.

Impact Phone for iOS

In Impact Phone go to Settings > Audio and disable all codecs except G.722, GSM, PCMU, PCMA.

Impact Phone for Android

Supported Codecs are automatically set. Nothing needs to be done here.

STUN Server

Impact Phone for Windows

Go to “…” > Preferences, click on the edit button of your account. Then set “Transport” to “UDP”, Enable ICE and add stun.l.google.com:19302 as STUN Server.

Don’t forget to click “Done” to save the settings.

Impact Phone for iOS

In Impact Phone go to Settings > Network and add stun.l.google.com:19302 as STUN Server. Also, make sure that in Settings > Advanced "Transfer Protocol" is set to "UDP".

Impact Phone for Android

In Impact Phone go to Menu > Settings. Ensure you have configured to the correct "Domain*": yourcompany.impactpbx.com. The domain information is provided in the welcome email. In the "Transport" field ensure it is set to "UDP". "Enable ICE" needs to be OFF. Click on "STUN / TURN Server" and enter stun.l.google.com:19302. "AVPF" needs to be set to ON.

Please Note: Settings to be applied: Enable the codecs PCMU/PCMA (ulaw/alaw, G.711), G722 and GSM and prioritise them by setting them to the top of the list. If no priority, then disable all other codecs. Make sure to set the "Transport" field to "UDP" and add a STUN Server, e.g. stun.l.google.com:19302 or any other stun server. Some other softphone clients have integrated STUN servers, these should be activated for usage. These setting can be applied to any client like Xlite, zoiper etc.