sendFaxStop
Stop an in-progress fax send operation on an active call.
This method stops a fax send that is already in progress. To initiate fax sending,
use the Relay client’s sendFax() method.
Request
id
The unique identifying ID of an existing call.
params
An object of parameters that will be utilized by the active command.
Response
Call Leg
Returned when the call is a standard PSTN, SIP, or WebRTC call.
OR
Fabric Subscriber Device Leg
Returned when the call is a Fabric subscriber device leg. The status field is always null for this type.