Replace 302C attendant console with 2420 telephone on AVAYA 8510 system

[solarmaze]

I would like to replace my 302C attendant with a 2420 telephone on my AVAYA 8510 system.

We have a single console, and do not make use of all its functions. There are no vectors or auto attendants involved.
The guard receives calls to our main number, and transfers them to the proper extension when needed.
There is a crisis-alert button, for notification of someone dialing 911, and a night-service button, which directs incoming calls to a different guard station that is manned after hours.

I want to use a single 2420, with a EU24 button expansion to replace the basic functionality of the 302C. I know there are a lot of fields to touch including:
Dialplan ana (looking for 0 treatment)
System feature (looking for attd entries at places like ISDN intercept, ACA referral, etc…)
Console parameters, etc….
But where do I actually assign which extension should receive the main incoming calls, etc…
I cannot find exactly what to do in any AVAYA documentation, or their support site, of everything I must touch to make this change.

Can someone please direct me. Thanks.

[mskinner]

You would assign that on the trunk group form in the "Incoming Destination" field.

[solarmaze]

That makes sense, but I only see that field on page 1 of one of my trunk groups. I have a trunk group for local calls, and another for toll calls... no "Incoming Destination" on either. It only appears on page 1 of a "tie line" trunk I have to a remote building???

[mskinner]

If your trunk group does not have an incoming destination, for instance ISDN or SIP, then the Service Provider would need to send DNIS digits that match the extension number of your 2420.