Error: No User specified.

How to use CallMeBot API:

http://api.callmebot.com/?user=userID&file=audo_file_url    (to play a mp3/raw audio file)
or
http://api.callmebot.com/?user=userID&text=Text to speech     (to play the Text to Speech)

UserID = User Alias (@niceuser) or Phone number (Examle: +34 694329888)

For more information visit http://www.callmebot.com.