13234: Dial->Conference: Invalid waitMethod

Set waitMethod on <Conference> to GET or POST only. Twilio uses this attribute when requesting waitUrl before the conference starts. If you specify waitUrl, the default method is POST. If you do not specify waitUrl, Twilio requests the default hold music with GET. Use GET when waitUrl points directly to a static WAV or MP3 file so Twilio can cache it.

• The <Conference> noun sets waitMethod to a value other than GET or POST.
• Your application generates TwiML with an unsupported HTTP method for waitUrl.
• You configured waitUrl for pre-conference audio or TwiML, but the associated waitMethod value is not valid.

• Update the <Conference> noun so waitMethod is set to GET or POST.
• Use GET when waitUrl points directly to a static WAV or MP3 file.
• If waitUrl returns TwiML, make sure your application accepts the same GET or POST method you configured in waitMethod.
• If you do not need custom hold music or pre-conference TwiML, remove the custom waitUrl and let Twilio use the default hold music behavior.

• TwiML <Conference>
• TwiML <Dial>
• Conference Participants API