I don't know how my T would handle a state of emergency as it hasn't happened. I called once to say I was in a crisis and needed an extra session, and he texted me (he knows I hate phone calls) to say he was trying to arrange an extra session and would let me know asap.

I don't think I would call my T if I was feeling imminently sui. I think that says a lot about me and whether I feel it's okay to ask for help. The most I'll do is text him and ask for an extra session if I'm feeling fragile.