t46g: intercom over speaker rather than headset?

[asinshesq]

I have a headset connected to a t46g via an ehs36. When I pick up the phone by clicking the pick up button on my headset, the phone goes into 'headset' mode (the headset light on the t46g turns on) and when I then hang up the phone (again by clicking the button on my headset) the phone remains in headset mode. That means that if someone else wants to intercom this phone, the sound comes through the headset and that is not what I want...I want intercom to always come over the speakerphone. So my question: how can I get an incoming intercom call to always come in over the speakerphone (or stated another way, how can I get the phone to exit headset mode whenever I hang up, or how can I set things up so that non-headset mode is always the default)?

Note that I have the t46g headset priority setting disabled so I don't think that's the problem.