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Does anyone have any ideas for ringing two phones at the same time when one extension is called. For instance, when ext. 225 is called they wanted the call to ring at ext. 225 and ext. 226 simultaneously. They want this to happen for all calls - intercom and CO. The PDN/SDN feature does not work because they need specific line appearance buttons on the phones and when you have line appearance buttons the call will ring at that button and not on the PDN/SDN buttons. The other idea is to play with the numbering plan and turn one extension into an ICD group and when someone calls that extension it could ring two phones but that could get messy. Please let me know if you have any ideas.

What type of system is this on? If you're using a KX-TD with appropriate software the "phantom extension" feature will accomplish exactly what you are wanting.

Would be at least TDA 5.1
Why specific buttons?
The display shows who is calling and on what line. (name)
Just have PDN on those phones.
or
ICD group, put all needed phones in ICD group, target that group
and make Group Mailbox with button on all phones or overflow to one box at main phone in group.

This is a new TDE-600 install and the software is the most recent version.

Thanks for the ideas. I was trying to avoid the ICD group method. Perhaps my understanding of PDN/SDN is not complete. If I program an SDN button at ext. 226 for ext. 225 and a call comes into 225, the call will ring first at any CO line appearance buttons at ext. 225 and NOT at the PDN button and thus not at the SDN button at ext. 226. Am I doing something wrong or is there another way to do it?

You need to use as a PBX. Use only PDN buttons and no line appearances. If all PDN the Intercom button does not work.
All those buttons are DN's. (Your ext) Call ext , appears on PDN, inbound, appears on PDN, DID, appears on PDN. Display gives extensive info on calls. SDN can be set to flash, ring or delay ring.
I am assuming a PRI.
Remember on incoming call cycle Display to the one that gives the info you want and leave it there, it will always show the same screen unless changed.

Not to confuse things but there is also a Group DN button to consider. Also is this call from an aa?

Thanks for the idea. It is a PRI but they also have 12 POTS lines as well. The application is for a police/fire department and it includes the 911 dispatch center. The issue with using all PDN's and not having any line appearances is that they are used to having different buttons for the different lines. So they currently have a handful of loop CO button for the PRI and then have single CO buttons for the different POTS lines. I understand that we could use all PDN buttons and eliminate the line appearances and rely on the display for the info. I will have to see if they would be okay with that. It would also eliminate the caller-id info if they are used to seeing that.