VM Notifications are generated in 'en' regardless of default system language setting

System default language is set to 'nl', but VM notifications are generated with channel language set to 'en'. Result is that recordings and numbers are read from en folder.

As a minimum, the vm notify should use the default system language, this dialplan mod works:

[vmnotify-main]
include => vmnotify-main-custom
exten => _X.,1,Macro(blkvm-set,)
exten => _X.,n,Set(CHANNEL(language)=${SIPLANG})
exten => _X.,n,Dial(Local/${EXTEN}@from-internal,300,M(auto-blkvm))
exten => _X.,n,Hangup

Even better would be to modify the AGI to read the astdb extension language for the mailbox in question and default to SIPLANG if not specified

/AMPUSER/5004/language                            : nl