Extension issue is ... propagating [pls. help]

for some reasons, when I call an extension i get:
a) “error 503” (if it doesn’t have VM enabled)
b) “I’m sorry, an error has occured” (if VM is enabled).

All codec definitions are the same as “ulaw”.

Now, if I Mmodify some VM parameter …
also an old working extension get demaged and became unreacheable.

Now, All new extensions have the same problem !!

… pls, can somebody try to help me ?

My pbx is going completly out of order … I’ve “demaged” 99% of extensions :frowning:

What could be demaged so that propagates the error to any newly modified extension ?!