Issabel (Elastix)

Enable the direct access so choose the Security tab.

Select 'ON' in "Enable direct access (Non-embedded) to FreePBX: ".then If you need to change DB
Password and click on the save.

Choose the PBX option on the left pane of the dashboard and choose Unembeded IssabelPBX.

FreePBX administration page will appear & Then choose the 'Tools → Asterisk SIP Setting'.

After completing the configuration click on the submit changes and apply config.

To create new Extension for 2N IP Intercom Devices, go to 'PBX → PBX Configuration' menu, chose "Generic SIP Device" and click 'Submit'.

Fill the phone number and name you prefer, fill in also the 'secret', which is the password for registration. "dtmfmode" and "transport" chose according your infrastructure needs and corresponding to 2N IP Intercom settings. Click the button 'Submit' and 'Apply Config'.

To enable accepting TCP communication open menu 'PBX → Asterisk File Editor' and open the file "sip.conf".

progressinband=yes
internal_timing=yes
silencesuppression=no

tcpenable=yes
tcpbindaddr=0.0.0.0

Then 'Save' the file and 'Reload Asterisk'.

To force SRTP communication with 2N IP Intercom switch the option 'encription' with "Yes (SRTP only)". Find it in menu 'PBX' → 'PBX Configuration' and click on existing Extension. Then you click on 'Submit' and Apply Config'.

 Following the settings on PBX, username and password should be filled in on 2N IP intercom, with IP address of Issabel server in to Domain,Proxy and Registrar fields.

In Advanced Settings it is you can enable Recieving and Transmitting SRTP calls.