POST /api/v2/channels/voice/callback_requests.json HTTP/2 Host: lifeangel.zendesk.com Authorization: Basic YWRtaW5AbGlmZWFuZ2VsLmNvOk1AZGR5MzYzNg== Content-Type: application/json Accept: application/json Content-Length: 97 Error: call to URL failed with status 500, response {"status":500,"error":"Internal Server Error"}, curl_error: , curl_errno: 0