Managing full voicemail inboxes

Sorry, I should have clarified. I looked at the voicemail.conf file and didn’t see it, because it’s default no doubt. At the bottom there is a line that says [default] implying that it’s getting defaults from somewhere. Do I need to go look through the asterisk code to find the defaults or should I have my script search voicemail.conf for the presence of maxmsg and return 100 if nothing is found?

I thought about adding the variable to the voicemail.conf file but I have this feeling that it will be removed if anything changes in the GUI in voicemail admin.