[Asterisk-Users] Message signaling on MGCP (light on the phone)

[Jean-Christophe Heger]

Using the mailbox=... in mgcp.conf, Asterisk will tell the phone if 
there is any voicemail or not. This status is called "vmwi", and it 
works well.

Therefore, the vmwi status is got only when the phone makes a 
transaction (ie. take a line and release it). At no time Asterisk sends 
the status to the phone while a voicemail incomes.

Does anyone have any information about this ? Is it the same with SIP or 
other protocols ? Is it a function we could use to force the status 
check and send it to the phone ? Does anyone knows how it works on Cisco 
phones ?

Thanks for any help