sundance-communications.com/forum Forums Other TDM Phone Systems Sprint - Tadiran Telephones & Systems Yealink message light on IPX Office

I have a Tadiran IPX Office. We are adding some SIP "Yealink" phones to the system. My problem is that I cant get the message lights to turn on when a message is left.
We are also using a T3 internal sip voicemail. in IP, 1, 4 ADD_VM_IND_TO_MSG_LAMP Y and in the phone I have turned on Subscribe for MWI, and Subscribe MWI To Voice Mail.
Anyone know if this can be done?