Cyberdata has designed the“Callbox Unit", an affordable door access solution for SMB customers. The Callbox provides the following functionality for UC500/SBCS: 1. The user can open a door remotely by dialing a set of digits from an IP Phone. This solution is scheduled to go though Cisco Technology Developer Program lab testing in the near future. When this testing is complete, the Cyberdata solution will be supported by Cisco TAC. Further details are available in the following application note: http://supportwiki.cisco.com/wiki/images/5/58/Cyberdata_uc500_Doorphone_... Marcos
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Found a solution vor DACH
Have a look at this "unsupported solution"
http://www.telegaertner.de/de/elektronik/telekommunikation/tuer-freispre...
It's just a ordinary ab phone so this schould work fine. I ordered one for testing and wil give a update to you.