SQL Server asterisk Extensions?

I have some problem about extensions so that I have realtime asterisk SQL Server.

I have table Extensions:

id  context     exten   priority  app   appdata
25  from_all    _270.   1         Dial  SIP/${EXTEN:0}@XX

This is how I have extensions but it isn’t working when I am calling 27070 it is not calling and saying that

27070’ rejected because extension not found in context ‘from_all’.
When I am correcting exten in base exten=27070, it is working but I need to do like that after 270 any number or string must goo can you help me?