Hi Chad/Dave,
The first easiest thing would be to try and set the ATA up with the same DN as the IP phone. I can't test this for you as we don't have CME setup right now. If that doesn't work then maybe you could change the DN on the IP phone to something new and assign the current DN to the ATA/Ringer. Put both the IP phone and ATA/Ringer in the same Pickup Group so that when the shop hears the Loud Ringer they could pickup the call from the IP phone. This would require a bit of training but shouldn't be too hard for the staff. It might be easier than trying to take away the nice new phone. I have found that once somebody gets a new Cisco phone, trying to take it away from them is like trying to get blood from a stone :)
Using Call Pickup and Group Call Pickup with Cisco ATA
Most of the procedures for using Cisco ATAs with Cisco Unified CME are the same as those for using Cisco ATAs with Cisco Unified CallManager, as described in the "How to Use Pre-Call and Mid-Call Services" chapter of the Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for SCCP (version 3.0). However, the call pickup and group call pickup procedures are different when using Cisco ATAs with Cisco Unified CME, as described below:
Call Pickup
When using Cisco ATAs with Cisco Unified CME:
To pickup the last parked call, press **3*.
To pickup a call on a specific extension, press **3 and enter the extension number.
To pickup a call from a park slot, press **3 and enter the park slot number.
Group Call Pickup
When using Cisco ATAs with Cisco Unified CME:
To answer a phone within your call pickup group, press **4*.
To answer a phone outside of your call pickup group, press **4 and the group ID number.
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Note If there is only one pickup group, you do not need to enter the group ID number after the **4 to pickup a call.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_guide_chapter09186a00806a7ffb.html#wp1059308
Hope this helps!
Rob
