General errors (0–9)

0 – no error

1 – invalid key

3 – user is blocked

2 – not enough parameters

4 – requested feature is not supported

5 – unknown error

6 – a non-existent tariff grid number is indicated

7 – invalid parameters

8 – not enough money

9 – tariff schedule is inactive

10 – wrong sending time

11 – the maximum number of messages processed simultaneously for sending has been exceeded

12 – maximum message packet size exceeded