Log in to the 3CX PBX WEB interface as an administrator
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_022600-1024x457.png)
Go to menu SIP Trunks
And click Add SIP trunk button
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_012842-1024x458.png)
SIP trunk settings
On the same page, just below…
Enter the username and password obtained during registration
Authentication -> Authentication ID (aka SIP User ID): USERNAME
Authentication -> Authentication Password: PASSWORD
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013032-1024x458.png)
Add default caller ID
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013211-1-1024x458.png)
Enter OK and reload the page to verify that the trunk is registered.
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013102-1024x458.png)
Add Outbound Rule:
Outbound Rule -> Add
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013520-1024x458.png)
On the same page, just below…
Make outbound calls on
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013531-1024x458.png)
Outbound Rules successfully added
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013548-1024x458.png)
Add New Extensions
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_013719-1024x458.png)
Next, you can enter the WEB phone at https://3CX-IP:5001/webclient
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_021827-1024x460.png)
And dial the number with the prefix 00
![](https://new.skytel24.com/wp-content/uploads/2020/05/Screenshot_20200506_022045-1024x456.png)