I have a Mitel Superset 420 telphone and would like to hook up 2 phones (only one of the needs to be a superset 420) to the same extension. It will only allow one phone at a time. Does anyone know anyway how to make this configuration work?

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If you have a current enough version of software, you can use the "Twinning " feature to associate two hardware ports together, to act as a single extension.

You could also program a key appearance of the analog set on the 420