PBX:

https://www.asterisk.org/downloads/asterisknow

Manage with FreePBX GUI by connecting browser to IP address of the AsteriskNow host machine.

Voicemail:

*97 = check voicemail

*98 = check any mailbox

Soft phone:

https://www.counterpath.com/x-lite/

https://support.counterpath.com/hc/en-us/articles/360001451094-How-do-you-set-QoS-for-Bria-4-5-in-Windows-

http://icanblink.com/

Tip: AsteriskNow acts as a bridge between two SIP phones. Use GNS3 wireshark to capture UDP traffic on either leg. Decode UTP traffic as RTP and Play Streams back using RTP Stream Analysis. It is possible to play back G711 codec.