Testing 1-2-3 . . . PART Two – 911 Networks

In PART One of this blog, we talked about originating the call in the enterprise and the importance caller ID has in identifying the origination point of the call accurately to the PSAP.

Now that our emergency call has made its way out of the MLTS, navigated through the local Central Office (hopefully unmodified and intact), it has now landed within the 911 tandem Central Office where it is ready for location digestion and termination at the PSAP. The selective router, typically a Northern Telecom DMS 100, or a Lucent E5, has the specific job of providing connectivity between local area PSAP’s and the local Central office switches that serve dial tone to the public. While no hard fast rule exists, it is common to find that selective routers provide service in a specific geographic area that often (but NOT always) aligns with local calling area LATA jurisdiction. Once again, it is important to keep in mind that there is no hard fast rule here. While this legacy design has worked for years, the architecture happens to be one of the many things about the legacy network that is stifling innovation today. [READ MORE]