According to the instructions given at

https://www.asterisksounds.org/de

I converted and installed German prompts successfully and for numbers, I can successfully listen to a German female voice counting or telling the date/time.

But unlikily, somehow the voicemail prompt is still English, although my general language settings are “de”.

I use pjsip.conf, not sip.conf. In asterisk.conf, there is the follwoing defined:

[options]
[…]
defaultlanguage= de_DE

In extensions.conf,

I use:

[general]
format= gsm
[…]

and for the inbound endpoint:

[inbound]
exten => THENUMBER,1,SetGlobalVar(CHANNEL(tonezone)=de)
same => n,SetGlobalVar(CHANNEL(language)=de_DE)
same => n,Set(DIALGROUP(group_isp2,add) = PJSIP/502)
same => n,Set(DIALGROUP(group_isp2,add) = PJSIP/512)
same => n,Dial(${DIALGROUP(group_isp2)},30)
same => n,VoiceMail(502@my-vmmbox)
same => n,Hangup()

and in voicemail.conf I have

[general]
[…]
tz= german ; Timezone from zonemessages below. Irrelevant if envelope=no. locale= de_DE.UTF-8 ; set the locale for generation of the date/time strings
(make ; sure the locales are installed in your operating system; e.g german= Europe/Berlin|’vm-received’ a d b Y ‘digits/at’ kN

So far.

In asterisk.conf, the directory for sounds data points to

/pool/asterisk/share/asterisk/sounds

which is comprised of

./en/
./de_DE/

de_DE contails all the .sln16 and .gsm files, owned by asterisk:asterisk, from the source above. Since the prompting of numbers and the date works well, but not the voicemail prompt, there is something fishy I can not fathom.

For your help I’d like to thank in advance,

Oliver