Hi guys, i have a big problem with client phones Aastra 6753i. At first, versions: 3CX Phone System v 11 SP4 Aastra phone 6753i - firmware 126.96.36.1992 Everything worked fine, but at moment when i changed extension name on Aastra, these phones are still showing old names on incomming or outgoing calls. I have tried to reprovision phones, restart 3cx phone system, reset phones to factory settings but without success. After upgrading Aastra phones to FW 188.8.131.522 and resetting to factory defaults, company phonebook is not downloading anymore. Who has the same issue with these phones? FYI - Grandstream phones connected to this 3cx PBX are working very good with company phonebook.