Configuring Calls to Cell Phones with 3CX and Paxton Net2

When visitors use the entry system to call residents, the cell phone (or home phone) number of the residents will be called and the resident can confirm the visitor and press “1” on their phone to release the door and allow the visitor access to the building.  The appropriate elevator floor will also be made available for the resident.

Adding and Changing Cell Phone Numbers for Residents.

Log into the 3CX Web Portal and select “Extensions” from the left menu

The search box can be used to quickly find a unit number.

Select a unit number and click the “Status” button in the button bar on the “Extensions List” page.

Ensure the “Current Status” is set to “Away”.  This should always be set for extensions that are used for Cell Phone forwarding.   For extensions that are used for Bria, 3CXPhone or other native SIP phones, the “Current Status” should be set to “Available”.  Click the “X” in the upper right corner to save and exit.

Select the extension and click the “Edit” button from the tool button bar

While in the “Edit” screen, Select “Forwarding Rules” from the top tab and in the “Statuses” section  ensure the “If in this status, forward calls as follows” is selected as “Away”.

In “Internal Calls” section, ensure “If I am away forward internal calls to” is set as “Forward to number” and enter the resident’s phone number in the “Eternal number” field.

In the “Options” section, ensure the “Accept calls from Ring Groups” is selected.


Click the “OK” button at the top of the screen to save settings.


Note: 3CX Phone System does have a “Forward to Mobile” feature however the DTMF is blocked by 3CX and so the “Press 1 to open door” will not work.  The “Forward to Number” functionality must be used instead.




About “Ring Groups”

Ring group settings are used to dial multiple phones when the resident’s unit number is dialed.  Ring groups can be found in the left menu in the 3CX web console.


Currently, a ring group is set up for each unit and includes an iPad extension as well as two cell phone extension.  Additional call destinations can be added for any unit by adding them to the associated ring group.

Note: The ring time is set to 60 seconds and to ring all destinations in the list. 

Note:  Once a unit is dialled, a call to cell phones needs to be initiated and the time to dial cell phone incurs a delay.  That delay is dependent on the cell phone carrier.

Note:  There are currently only two lines on the system which limits forwarding destination to two.  Additional lines can be added which will allow additional destinations and concurrent calls.


How to Fix the 3CX “The IP has been blacklisted”

For the last couple weeks customers have been getting massive amounts of log emails about blacklisted emails.   Of course these are random computers on the internet fraudulently attempting to gain access to your 3CX Phone System.

The good news is that this is very common practice and that 3CX does a good job of identifying and blocking these villains.  These emails can be disconcerting and those attempts can be blocked before they reach your phone system.

Most of our customers have PFSense firewalls installed.  PFSense is an exceptionally well priced enterprise grade firewall and has the ability to properly handle VoIP traffic as well as very advanced security.   To block these fraudulent attempts to access your phone system, I recommend using PFSense and the PFBlocker package.

Stay tuned for a YouTube video on how to set this up.

PFSense firewalls are available from our online store.   We recommend the SG3100 firewall or the SG1000 for very small sites.  Find PFSense firewalls on our online store at:



Demonstrating the Paxton Access Net2 Video Entry for Building Security

Video Building Security allows employees to enter a building with their FOB by holding it to the door.  Visitors simply dial a unit and have their identity confirmed with a video call before remotely releasing the door.

The Paxton Access Net2 Entry system also controls elevators so floor security can be ensured and only the proper floors related to the authorization are granted.

All access has a audit trail so that entry can be reviewed at a later date.  Entry can be immediated denied by cancelling access to any FOB given to an individual employee or resident.

This integrates with 3CX Phone System or other SIP based phone system to provide the video call or by using video monitors from Paxton.

Learn more at: