At my aunt's travel agency, Only 2 of the dtu 16 display phones ring (ext 100 and 101). 102-107 do not ring but work fine.

I had already tried turning up the ring volume and making sure DND was not set before finding this forum.

How do I get into program mode to change these settings? So far I've searched around on these forums and tried the ****** or ****** way but the screen just says ERROR. (I'm trying on the ext.) Anyone have any suggestions?

Thanks,
Shirley

[Edited by Keighlar for passwords. Please do not post passwords in the open forums.]