noob questions

Well I've been meaning to look into jmp.chat for like a year and finally got a chance, and it's very interesting. I do have some questions, it'd be great to know the answers to these:

• I currently use Monocles as my mobile XMPP client (yet another Conversations fork) and Gajim on desktop, will these (especially Monocles) work well with JMP.chat? I don't want to give up emoji reacts and message replies in XMPP and I saw somewhere that Cheogram doesn't support these yet.
• I currently use a hardware SIP phone (a recent Grandstream wifi phone) for most of my calling, will it be easy to use with JMP.chat and will TLS+SRTP be supported?
• How good is the filtering of spam calls? I stayed on Google Voice for years because nobody else had credible spam filtering, and only jumped ship to a certain mom & pop VOIP provider once they got spam filtering which works somewhat well. This is important because if there are too many spam calls I'll just start ignoring the phone altogether.