Define 'emergency'
I have this annoying thing. When people burst into the room yelling about 'emergency' or 'this has to be solved now or else ...' I ask them if the building is on fire or perhaps someone is dieing.
No? Perhaps something is happening that puts the business in serious financial or reputational risk? Oh, again the answer is no?
Where is the emergency?
In case of true emergency it's a drop everything situation where people will be dragged out of meetings.
You don't need to 'work' with text message, one saying 'call me asap' with a short description of the problem will do.
In case of something important happening face to face contact is best. After that phone call. Only after that electronic communications like e-mail.