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 As stated in the SIP Trunk introduction from the authentication point of view there's no difference between encrypted or unencrypted SIP Trunks. We can have authenticated unencrypted trunks as well as encrypted unauthenticated ones. In 

There are two types of trunk that you can create, depending on the authentication type:

1. username and password: you must insert username and password
2. IP based: leave the username and password fields blank and fill in the HOST parameter.

The fields have to be configured as follows:

• NAME: a meaningful name for this trunk
• HOST: IP address of the SIP server provided by ITSP
• OUTBOUND PROXY: IP address of the outbound proxy server provided by ITSP
• VIRTUAL PHONE NUMBER: associated virtual number
• USERNAME: login username
• PASSWORD: password for the username entered above
• PORT: registration port of the service
• REGISTER: select if you want to have only outgoing calls or incoming (see below for deeper explanation)
• CONCURRENT CALLS: maximum number of calls on a single trunk
• NAT: enable/disable the Network Address Translation configuration
• DIRECTMEDIA: experimental sound management in P2P mode without routing the audio stream through the server
• SENDRPID: the Remote Party ID, used to interconnect with VoIP Provider for the management of privacy
• DTMFMODE: tone signaling technology used for this SIP interconnection
• ALLOW: voice codecs used in this trunk
• DISALLOW: voice codecs denied in this trunk

Register option

If the trunk is going to be also used for OUTBOUND calls (external calls) you need to be sure that the "Register" checkbox is checked. In this case the "Name" and "Secret" fields are mandatory as well. Otherwise you can uncheck the "Register" checkbox so the above fields will become optional.

Fill out the fields accordingly to the guidelines above and when you are done click on the "Update" icon at the bottom of the page.

You can get back to the "Sip Trunk List" page where the Sip Trunk table is now filled based on your settings (

A notification will inform you about the progress of the operation. The number shown in the notification is an internal identifier in the database and thus can be ignored. 
To check the entered data of the SIP Trunk click on the "Host" value into the table (for example in this case you should click on "10.0.0.101"). This will open again the Edit Sip Trunk page with the previously entered data.