stubborne

This is going to be incomplete, sorry - it's been awhile. I know the tn556 will support 2 voice terms per port and it's a 4-wire connection. don't remember the pinout on the RJ45. Obviously, you program the switch with the extension and type 8510T. You also have to program the spid on the phone: for an 8510:

press menu
press mute
press 43*
enter extension
press #

you should get a double beep from the phone.

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Stu