asterisk users - Oct 2014 - Asterisk 12.6 and MWI, no more working

Hello,
while moving from asterisk 12.3 to asterisk 12.6, I see the MWI support for
voicemail has stopped working. If I check "sip show peer 104-DEVEL" on
asterisk 12.3, I can clearly see the "Mailbox" option set, while on
asterisk 12.6 it appears empty.

Is there anything to do more for having MWI to work on asterisk 12.6? I
just moved the configuration used for asterisk 12.3 to the one running
asterisk 12.6

Leandro
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