70703d55_oice__VoIP__and_Text_Messaging__Description
[Parameter] RecordingUrl [Description] 
The URL of the phone call's recorded audio. This parameter is included only if Record=true is set on the REST API request and does not include recordings from or . RecordingUrl is only present in the completed event.
Twilio Cloud Communications - APIs for Voice, VoIP, and Text Messaging
Description