I believe you’re trying to accomplish a similar setup as in this post:
Right now, I have several phones that play music. With the Sangoma and Yealink phones, you can enable barge, so a page will put the “Music” on hold. But essentially, I currently the music working as phone calls. I haven’t tested through the other thread listed above, but it would be nice to multicast a music stream.
Based on what I remember, I could get the music stream to multicast, but the main issue I had is once they paged or made a call, it would cancel the stream and the device would never resume, unless I stopped and started the music stream.
Chris