[aprssig] IGate test needed

[Robert Bruninga]

>>> steve at dimse.com 01/29/05 11:52 AM >>>
> However, the RF user does not need the number, so all 
>you really need is a unique ID, right?

Not at all.  Exactly the opposite!  The IRLP or EchoLink DTMF 
number is what the mobile needs.  The callsign of the node is 
useless to him.

The scenario of using IRLP and EchoLink by a mobile is
as follows.  He is in a local or a strange area.  He sees he
is in range of an IRLP or EchoLink node and wants to talk
to another APRS operator anywhere on the planet.

He sends that APRS station an APRS message that says
"call me on EL-123456"

If he gets the voice call, then the other person was there,
available and willing to make the call.. But conversly if
he does not get the call, then no NETWORK assets
were consumed with a dead-ended call, the only cost
was an un-answered APRS message.

The converse approach which is very wasteful is to know
the Node address of the other end, then loggon to your
local IRLP or EchoLink node, then doa voice connection
to the other end, and then call by voice "Joe, are you there?"

If joe is there, then yes, this is successful, but then he
didnt need APRS at all.  If joe is not there (the much 
more likely scenario) then two IRLP or EchoLink nodes
were tied up for sseveral minutes or more for an
unsuccessful call.

That is why the scenario for using APRS is dependent
on the CALLER, sending an APRS message to the
CALLEE saying "call me on #123456".  This one message
is all that is necessary to place the call no matter where
the CALLER or CALLEE is.  Hence this is the design
scenario for this marriage of APRS with Ham Radio VOIP.

de Wb4APR, Bob

Steve


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