One limitation of the 3CX softphone is it has no BLF for Shared park, and you cannot dial SP1, SP2 etc. to pickup shared park calls. In order to create a shared park extension that the iphone or android client can dial to pickup shared park calls do the following: Add an extension, ideally one.
If you are trying to get Acrobits SIP phone working on your iPhone with the 3CX VoIP telephone system use the settings indicated below. For the domain entered the local network DNS name of the server i.e. what is used to connect to 3CX on the local network. For Register via leave the default setting.
The instructions “How can I use the 3CX Tunnel with a SIP hardphone?” on the 3cx site at http://www.3cx.com/support/3cx-tunnel.html-
3CX needs the following ports forwarded to the VOIP server in order to work. The documentation does not by default describe which ones are meant to be TCP and which UDP so here they are: Port 5060 (TCP and UDP) – Used for SIP protocol transmission