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 of domain
Here [...]
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 are DUD – IGNORE THEM.
If you want to configure a SIP hardphone the default tunnelling port is 5090, not 5080. To see the Proxy and Registration settings as shown below on the SPA 942 in the admin setting [...]
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 – must be a static mapping, no port translation
Port 5090 [...]
