Arthur, yes, the 2563 has a double headset jack on the rear and the key next to the numeral 3 on the touchpad.
The wiring diagram for the 2563 doesn't have the S-V, V-G, V-BR, BR-V and G-V pairs. The tel set has the leads inside, but they're insulated and stored.
If the wiring diagram for a 2565 were compared to the wiring inside the 2563, there would have to be a V lead to the dial, which the 2563's 35Y3A pad doesn't have.
Bill
