Yep! It would be great if there are choices for users. :)
 
Sent: Wednesday, May 01, 2019 at 3:33 AM
From: "Pierre Neidhardt" <mail@ambrevar.xyz>
To: "Ben Sturmfels" <ben@stumbles.id.au>, "Dexter Morgan" <dextermorgan@asia.com>, guix-devel@gnu.org
Cc: help-guix@gnu.org
Subject: Re: Missing Secure and Private Communication Applications in Guix
We also have Jami (ex GNU Ring) for VoIP.

--
Pierre Neidhardt
https://ambrevar.xyz/