​Mixvoip uses a default music on hold on Cloud PBX published under the creative commons license
https://creativecommons.org/licenses/by-nd/3.0/
https://www.jamendo.com/track/747913/sooslix-wind-song

“Tunguska Electronic Music Society” is the independent creative group of free artists who compose free music for free people. The creative lab of the community is based on Mutual Respect, Love and Understanding. Every wishing person who shares the community’s principles, ideas and aims can become a part of “Tunguska Electronic Music Society”. The target of the community is the creation of the alternative musical, video and cinema cultural layer, where the main motivator of the creation is the creation itself.

http://tunguska.org/ru/

In case the Customer uses the default music on hold, it is the Customer’s responsibility to credit the artist in accordance to the rules of the CC BY-ND 3.0 convention described on
https://creativecommons.org/licenses/by-nd/3.0/

​Customer can find a model of letter to inform the Copyright Collecting Society here.

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