Connecting telephony in Yii2?

Question

Yii

Hello! It is necessary to connect telephony, namely, when the call occurs, the client profile is opened. Telephony from Beeline gave me documentation.
Description: The
subscription can be used to integrate with third-party systems that need real-time call control over cloud PBX subscribers. The API uses a mechanism for subscribing to events associated with a particular subscriber, number, or the entire client. For example, a Cloud PBX subscriber receives a call, a third-party CRM system receives updates on the current status of the call (ringing, established, completed).
Documentation : BW-XSIInterfaceSpec-R200.pdf
Schema for XSI-Events : XSI-Schema-Rel20.0.zip
But how do I listen to an event on the CRM side