I thought this was an interesting question so I did a little research on GN Netcom and specifically the 2220. I called their support 1-800 centre and spoke to a tech who looked into this and the answer was "not supported".
I also found this compatibility page that also gives the "thumbs down" to the 2220. This page does list some Models that do work with the 7940 (both Corded and Cordless);
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...