Google voice has discontinued its SIP integration thus currently there is no alternative to it.
If you have an app that allows you to make Google Voice Calls you can simply configure the Calling Configuration in Salesmate to "tel:[number]" where it will prompt you to select the respective app using which you will be able to make the Google Voice Calls.
To configure Calling Configurations:
- Click on the profile icon top right corner
- Hit Setup
- Customizations > Calling Configurations
- Specify your click-to-call settings : *Provider - *Syntax
You are good to Go!!