SMS errors (20–39)

20 – SMS not found

21 – invalid phone number

22 – no external SMS request ID

23 – SMS with this ID is already present

24 – invalid payload request

25 – invalid originator

26 – empty or too long sms text

27 – invalid external SMS ID

28 – invalid SMS validity time

29 – task id is invalid

30 – task not found

31 – the phone is already in the mailing list

32- sender not allowed