One of the persistent issues I hear from customers is the ability to put a call on hold when another call is coming in. 3CX sees the extension as in use and will not ring to it or allow it to be used unless it is not in use. One suggestion is to provision a phone to register for two extensions, like 101 and 102. In theory the second extension would ring if the first was on a call. One would be able to put 101 on hold and pickup 102. Tech support suggested that it is possible to provision a phone for multiple extensions but they could not support it. Has anyone tried to do this and if so, did it work? Specifically, I am using snom 821 phones and it would be great to be able to offer this.