Display phone number on salesforce task record

Thats the major problem actually. Ringcentral is not doing a good job at matching with the contact entities. I have no idea why and have not been able to get an answer. Having the phone number on the task would allow me to automate it myself. Can you explain to me why ringcentral is having so much trouble attaching tasks to contacts? 

Here is a screenshot. As you can see none of these calls have connected to contacts. They do connect but it is very rarely (less often on inbound than outbound). If you can help me understand why I would really appreciate it.