possibility of secure SIP phone support

Hey, just wondering what the possibility is for future support of secure connections for SIP phones, as this is a bit of a roadblock for me as I have a hardware SIP phone and find it a lot less painful to use than any softphone I've ever tried on desktop or Android.

My current provider offers SIP over TLS + SRTP for the actual voice traffic. While I understand that the call is eventually handed off to the insecure PSTN, encryption of the traffic traveling over the public internet is still a pretty strong preference for me.

I'm basically just looking to understand if this is a 0% probability, possibly maybe in the next 5 years probability, or something which could conceivably happen soon.

One additional bit of context is that I'm mostly looking to maybe jump ship from my current provider due to poor SMS/MMS support. I'm much more satisfied with their voice service, and while being able to do voice over XMPP and potentially not have to use warty SIP softphones is a big plus, I'm already happy doing 90% of my voice calling on a dedicated hardware SIP phone.