Using different protocols for emergency call predates any caller location information.
The main drivers at the time were network coverage (your SIM might have no coverage, but a network you are not allowed to roam for ordinary calls in has) and congestion (emergency calls can preempt ordinary calls).
The main drivers at the time were network coverage (your SIM might have no coverage, but a network you are not allowed to roam for ordinary calls in has) and congestion (emergency calls can preempt ordinary calls).