In news:mn.75587d723f978cfe.48968@blueyonder.invalid,
Jono <nothanks@blueyonder.invalid> typed:
>
> I'm not sure how the GATE is supposed to integrate with the PSTN,
> however, the SPA3000 is essentially in two parts - a PSTN side & a
> VoIP side.
>
> Whenever a call comes in on the PSTN, it is then passed to the VoIP
> side of the ATA, presumably using some VoIP internally.
>
> Only when the power is off (and a relay shuts) is the attached phone
> actually connected to the PSTN.
>
> The SPA clearly sees the CLI before the ring, then passes the call to
> the VoIP side together with the ID intact - however, there is a one
> ring delay between when the PSTN line rings & the connected phone
> rings.

That's interesting. I haven't actually tried to get CLI from a BT line
plugged into the PSTN port of my Grandstream 486, since I already have stand
alone caller display units directly connected to the BT incoming line (one
of which also indicates CLI of calls waiting). What I have found, though,
is that the facility on the 486 to access the PSTN line only works properly
when you have a "real" PSTN line connected, and not a PABX extension, which
is how I first tried configuring it. I think it must be something to do
with ATA needing a full 50v line rather than the 24v it gets from the PABX.
The 486 also senses when no line is connected to the PSTN port, in which
case dialling ** gives an engaged tone.
--
Don