Does the merlin 410 require a feature module for speakerphone operation or is it a feature in the base unit?
I appreciate an info you can give.

It's been a while but I think that the speaker phone is all fixed features that don't need a feature module.

you need feature module 2..........

Feat Pac # 1

5 party conference
on hook dialing
call transfer
hold reminder
group listening
call restriction
privacy
auto dialing
last # redial
automatic line selection
do not disturb
ringing options
speakerphone
personal speed dialing


Feat Pac # 2

All features of pac # 1
plus:
Call pickup
Call waiting
Distinctive ringing
Line request
Message waiting
Privacy alert
Send message
Transfer return
Auto answer intercom
Group paging
Saved # dialing
Call restriction ( 3 levels )
System speed dialing

Music on hold cartridge
Music on hold / paging card

Told you it's been a while,

still love those old boat anchors......