T48G Intercom Auto-answer

[cm21]

No, we did not have Intercom set up on the old firmware either, so I'm not thinking it's a firmware issue. We are using Asterisk as the server.
I have not seen any documentation about what is required to have a working Intercom setup with automatic speakerphone talking, whether it be settings on the server or on the phones. Can you advise or point me in the right direction please?

If server-side support is needed, then I'm not understanding, what is the difference between adding a DSS key "BLF" button and an "Intercom" button? Does the phone send a different type of request so that the server knows whether a BLF or an Intercom button was pressed?