Anybody ever seen Analog VM on an SX50? How did they make it work. I know how on 200D but I don't think you can use Speed Dial within the system. And, I don't thonk the SX50 is capable of in-band signaling to an analog port.
I always used COVoice and a COV card.
Cheap way of doing it: Calls recall to the console, who asks if caller wants to leave a vmail. Attendant trnafers to vmail and dials room/ext number and hangs up. Guests press programmed vmail button / light and enter a password if required.
Need MS55 software & it enables ONS vm port settings.