I am trying to locate a user manual for the nec dtu-8d-2 phone. Also do anyone know if it is compatible with the infoset 408 system. My company put me in charge of installing and setting up an infoset 408 system with 4 dtu-8d-2 phones with voice mail. I am having lots of trouble.
1) Can not get the music on hold to work with external source.
2) Can not turn on voice mail?
Thanks for any help