Mapless GPS

Alexey Feldgendler alexey at
Fri May 23 01:27:19 CEST 2008

On Thu, 22 May 2008 20:48:28 +0200, Carl Snellman  
<carl.snellman at> wrote:

> Just FYI, I'm actually in process of registering well-known SMS ports
> for this purpose with IANA, so that interoperability between devices
> would be facilitated. If we get the registration through, there would
> be two known ports: port X for receiving someones location, and port Y
> for receiving a location request from someone.
> Below is the email I originally sent to IANA. All comments are welcome!
> I also though about getting TCP/UDP ports registered for the same
> purposes, but there the biggest problem is identification and
> authentication of the sender. With SMS, MSISDN can be quite reliably
> used for identifying the sender, but no such identifier exists in
> TCP/UDP world. Let me know if you have any ideas/comments on this!

This is exactly why it's not a good idea to register a TCP or UDP port for  
it. It's better to use a well-established protocol where authentication  
issues have already been solved. I'd recommend to go for an XMPP (Jabber)  
protocol extension.

Alexey Feldgendler <alexey at>
[ICQ: 115226275]

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