- Oct 4, 2007
We are converting our office from Grandstream phones to Mitel SIP phones (better sound quality) I have got everything working except for the message waiting lamp. I can't seem to figure it out. I have got the vm button working on the Mitel phones but the lamp won't blink when there is a message. It does when there is an incoming call. I am testing on a Mitel 5330 SIP. Any Ideas?