Without knowing your requirements, it's hard to make any real recommendations. Mumble, XMPP Jingle (groups possible) and Matrix all are options with audio (and some video) call support. Source: about 2 years ago
Take encrypted file transfer for instance. let's say I'm in an OMEMO chat session with you and I click my client's "send file" button. How do I know whether or not my file is going to be encrypted? there's enough wiggle room at the intersection of all of the relevant XEPs (not to mention client-defined behavior) that I'm not sure I could actually tell you for sure without looking at the source code for both clients. Source: over 2 years ago
Unnecessary for a chat protocol. In addition, if you want that you could just move to XMPP instead which does have XEP-0166: Jingle SIP-like session initialization. You could also use Mumble instead. Source: almost 3 years ago
Do you know an article comparing Jingle to other products?
Suggest a link to a post with product alternatives.
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