The Connector API methods are what you implement in order to be
notified when messaging or telephony events occur within the Salesforce
org.
The Connector API is for partners who are implementing Bring Your Own
Channel for CCaaS or Service Cloud Voice with Partner Telephony.
Important
Common Connector API Methods
The common Connector API methods apply to all third party vendor systems, including Contact Center as a Service (CCaaS) and voice systems.