GPS for 911 calls

Perry E. Metzger perry at
Wed Mar 7 12:57:30 CET 2007

Harald Welte <laforge at> writes:
>> Wireless Enhanced 911 for mobiles, including GPS or other
>> radiolocation data, is a US standard. I don't know how the signaling
>> works, but if you are selling a new phone in the US, it is mandatory
>> that you comply.
> Please see
> "however. TDMA and GSM networks such as Cingular and T-Mobile use TDOA"
> which is location singulation based purely on the network.  No device
> support and no GPS needed for that.

Ah, so the network does the work, not the phone. On CDMA I believe all
the phones do the signaling.


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