PT,
Yes presuming a T7416. If you have an ICS 2.0 or better just do it from another set, if you don't temporarily replace the T7416 with an M7310 and place the lines on the keys, then switch back. YOu will need DR5 and above for this. The T7406 uses M7310 buttons 1,2,3 and 7,8&9.
If you are using an ATA to analog phone, you program the ATA as a normal phone. Only thing to note is it is only possible to move between two calls.
Are you sure more than three lines can be programmed to the T7406 .The manual says only three lines can be programmed. Have you tried it? And did it work?
That was the first time I installed the T406 cordless and I lost the addendum setup paper. I had to call for some help. Maybe next time I have better luck. I hate being rushed to other calls.
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