When I send zoiper a notify from asterisk the voicemail counter does not go up, but it works for all our desk phones. Does zoiper only with with the push notifications in the API?
event=>message-summary
Content-type=>application/simple-message-summary
Content=>Messages-Waiting: yes
Content=>Message-Account: sip:asterisk@127.0.0.1
Content=>Voice-Message: 1/0 (0/0)