Freepbx

1. Log into the FreePBX webGUI

2.Click on Trunks, located under Connectivity

3. Click on 'Add SIP (chan_sip) Trunk', to add a new trunk

4. Give your new Trunk a name. In our example, we called it 'Vega-test'

5.Configure  'Sip setting/Outgoing Settings'  details
a. Configure the Trunk Name 
-> This should be a same as you username on Vega
In our example in the picture below we used 'vega'

b. Configure the PEER Details 
Insert information for:
-> host:                         (dynamic)

-> type                           friend

-> username:                (The Registration and Authentication ID used when configuring the Vega Gateway)
-> secret:                      (The Authentication password used when configuring the Vega Gateway)
-> <insert the rest of typical details, as seen in picture below> 

example:

Last step is to submit/ Apply Configuration.

To verify in freepbx , navigate to Reports ->Asterisk Info->peers