Are you referring to Austin/Travis County EMS? They are on GATRRS. ATCEMS has a broadcastify feed that you can listen in on. Austin FD/Travis County ESDs used to have one but the feed manager moved out of the area.
I tried to contact the feed manager that had the FD Travis county before he moved, because I was trying to set up the feed once he left. I listen to the EMS channel on broadcastify, but it doesn't have near the traffic that the FD had.