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Assumed Network Model Two types of network configuration Emergency call reception office is connected to IP network via PSTN using existing emergency line, and Connected directly to IP telephony network via a new IP line But VoIP only at this stage Subscriber PSTN Subscriber Office Office *: Each office uses another line (e.g. IP-VPN) for acquiring the geographical location information of the reporter from an operator. IP network IP network PSTN model All IP model |