Asterisk Realtime Invalid Handler Error

I am using Asterisk 1.6.2.19 with Realtime.

As I initiate a call via the callfile

Channel: SIP/1000000

Callerid: <1000000>

Context: local

Extension: 20

Priority: 1

into a certain context and extension unfortunately there occurs the error:

Channel 'SIP/1-0000001' sent into invalid extension 's' in context 'default', but no invalid handler.

It is strange since the default context from the error message is the one which contains the switch-statement in the extconfig.conf:

[general]

static=no

writeprotect=no

[default]

switch => Realtime/lokal@ex开发者_运维百科tensions

Nevertheless: The phone rings but as one answer the call the line is busy.

Does someone know how to solve this problem? I.e. How to initiate a call with Realtime?

I made an error: in the extconfig the extension is "local" but not "lokal"