Zoho CRM app (Android) visual notifications on incoming call

Zoho CRM app (Android) visual notifications on incoming call

Hi

I have an VoIP setup with Zoho CRM's Twillio integration. 

I can call out using the CRM and incoming calls are logged as activities

However, when someone calls in, I don't get a visual notification on my phone for which i can click to answer ?

How do I set this up ? I mean, its crucial O get some sort of heads up when a contact is call me ;)

Thanks 
Danny