4 thoughts on “AT&T’s IP-Centrex”

  1. One note of interest: as a CLEC with operations in over 100 markets nationwide, AT&T has interconnections to the ILEC E911-serving tandems, enabling it to provide “real” E911 in a significant footprint. When the SBC deal closes and a minimal level of integration happens, the footprint gets even bigger. That is an ability that Vonage et. al. don’t have.

  2. A clarification question: I am assuming that Vonage get the phone number from a CLEC. If Vonage forces a subscriber to bo non-nomaidc, can’t they deliver the E911 call through the cLEC to E911 system as if the call had originated from the CLEC? In other words, isn’t the real sticking point is the conflict between the desire to allow the customer to connect from any point and the ability to deliver the E911 call to the appropriate local agency?

  3. Could be. Not clear if all the CLECs that Vonage works with have the appropriate kind of trunking to the E911-serving tandems, if the interconnection Vonage is using to the CLEC switches enables the gateway to signal ANI to the CLEC switch, and if so if the CLEC switch will take an ANI delivered to it over this interface and map it into the signaling going to the E911 tandem. All of that is necessary to get the ANI to the E911 tandem for delivery to the PSAP; the correctness of the location information associated with the ANI in the ALI database (which implies a non-nomadic phone number) is needed on top of that to provide the location info.

    In AT&T’s network, since they own the gateways, the switches, and the interfaces between them, it’s technically possible for them to ensure the caller’s ANI is delivered over the E911 tandem trunks. (I don’t know if they do or not, but it’s possible.)

  4. The basic requirement you stipulate for the interface between Vonage and CLEC can be met by Vonage without depending on ILEC. So I am assuming that that condition can be met. That leaves with nomadicity.

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