i2 or i3 for IP Networking
Millions of VoIP calls, including 911 calls, must be routed to PSAPs.
Under i1, the VoIP 911 caller is routed to a PSAP via the PSAP's 10-digit number.
Under i2 (the ”interim” solution ratified by NENA), the VoIP 911 caller is delivered through the E9-1-1 system with the ANI/ALI.
Under i3, PSAPs operate in a fully IP-enabled, Next Generation E9-1-1.
As systems become more distributed and the telecommunications infrastructure becomes more IP-based, accurate network timing becomes even more critical. A seemingly inconsequential difference of seconds or minutes between two workstations in different locations could result in calls taken after responders are dispatched to them, according to the official records. Such a timing problem would cause havoc on the logic used in CAD systems. Data networking could also suffer from these timing conflicts, as log files from routers and other network devices must be accurately synchronized to support troubleshooting (including defense against network attacks).
Timing is proposed as a requirement in the IP-Capable PSAP document now being authored by NENA.
Which one are you operating under? Contact us to discuss your upgrade possibilities to a NetClock master clock and time server.