When members enter and leave a conference, and when a user presses the digits that match the digitsMatch parameter, Plivo sends an HTTP POST request to the callbackUrl. See “Parameters sent to the callbackUrl” above for a list of parameters that are sent to the callback URL.
Response
<Response>
	<Conference callbackUrl="https://<yourdomain>.com/confevents/" callbackMethod="POST" digitsMatch="#0,99,000">My Room</Conference>
</Response>