Tx Lorne - it’s working now. I did what you suggest in a slightly different way before, because I had already a extension_custom.conf file for DID number stripping like this:
[DIDmapping]
; removes the DID prefix before routing a DID call to an extension
include => from-did-direct
That’s why I thought to change it it his way:
[DIDmapping]
; removes the DID prefix before routing a DID call to an extension
include => ext-bosssecretary
include => from-did-direct
because the from-did-direct context already exists in the core extensions.conf, but this didn’t work.
So finally I did what you suggest:
[DIDmapping]
; removes the DID prefix before routing a DID call to an extension
include => from-did-direct
[from-did-direct]
include => ext-bosssecretary
and this is working 
so it means that in extensions-custom.conf you can define already existing contexts and add includes in it - that’s great - I did not know this.
I think it’s a pitty that this module is abandoned - it’s a very nice feature used a lot in Europe. The suggestion of el_es does only partly solve the issue as ringing of the boss is not silent and also the overruling by “chiefs” is missing.
With more than 250 views already it is maybe time to reconsider the module ?