Voice over IP (VoIP) Interface allows all 400-Series Emergency Phones to be used over an IP data network. VOIP units integrate seamlessly with existing VoIP phone systems, and support standard SIP, SPP and H.323 protocols. For sites without an existing VoIP phone system, two VOIP units can be used in conjunction to send emergency calls over the IP network and then to remotely "jump off" onto an existing PBX or PSTN phone network.
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