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 [...]
Configuring Pennytel as a VOIP provider
After the intial 3CXÂ install see http://technicians-blog.kingcomputer.com.au/index.php/installing-windows-3cx-voip-telephone-system-with-pennytel-part-1/
 Highlight VOIP providers and on the toolbar click Add Provider. Fill out the details for your pennytel account as shown. Make sure you have a trunk service from pennytel, otherwise you will only get one call in or out at a time. I set the [...]
I have been configuring a 3CX Windows Voice over IP phone system. We use an Asterisk VOIP system in the office but I thought I would have a look at windows based VOIP system. 3CX offer a free edition for up to 4 simultaneous lines, but the enterprise version for more lines is still under [...]