Grandstream Wave (iOS and Android Softphone)
From VoiceMailTel Wiki
Grandstream Wave Mobile (Iphone and Android)
Download Grandstream Wave from the Google Play Store or Apple App Store. After it’s installed, open the app, then, click on Settings - Account Settings, click on the plus icon located on the top right of the page,select UCM Account (QR code scan) and scan the code generated on the VoiceMailTel Online Portal or provided by your VoiceMailTel Customer Account Representative.
NOTE: To generate a code for your mobile softphone, simply log into your VoiceMailTel portal, click on “Terminals”,then click on “View QR code” next to the terminal of your choice. Select your softphone from the top of the page and scan the QR code.