As someone else mentioned, VOIP over the 23cm DD link may be a challenge
for a few reasons. However, I think DV is the right place to focus PSTN
interconnect. Then you have the choice of 2m, 70cm, and 23cm and by
taking advantage of callsign routing calls can be addressed accordingly.
The debate about reverse autopatch aside, here is a scenario that is
1. Create a channel driver for Asterisk that talks to an AMBE chip
(either the DV Dongle or something new, like a multi-chip PCI
card) - there is actually one written by KI4LKF, but probably
needs a lot of refinement as he is using a different approach for
his DPLUS alternative code.
2. On the gateway create a callsign addressable route to the Asterisk
box using SIP or IAX2
3. On the Asterisk box configure a 'trunk' that is AMBE only.
4. Create a dialplan on the Asterisk box that uses the AMBE trunk to
callsign address D-STAR radios e.g. IAX2/iaxdstar.org/K7VE or
SIP/sipdstar.org/K7VE. Make individual stations extensions on the
Asterisk PBX, e.g. extension 1000 is mapped to
IAX2/iaxdstar.org/K7VE or assign a DID (Direct Inward Dial) such
as +1-800-555-8355 mapped to IAX2/iaxdstar.org/K7VE. - with this
setup K7VE could be signaled of incoming calls by an alert and
withing the text portion of the signal the callerID of the caller
could display and K7VE could either accept the call, send it to
voicemail, or drop it entirely. Also, with the features of
Asterisk, the incoming call could be directed first to another
PSTN number (landline, cell, etc.), and if those were not answered
then the box could play audio instructions about proper Amateur
Radio communications before signaling the called station.
5. Calls from the radio could accounted for (and controlled) by the
callsign of the calling station. Including a limited dialout plan,
full record keeping (log) of all calls, and recording of such
calls for later review.
Something to work towards, I think.
Don Russell wrote:
> Also would like to know of anyone successfully using VOIP.
> Is it possible to send voip over the high speed link.
> I am thinking asterisk box with a standard pstn connection
> at the AP and some kind of IAX client running ILBC
> or GSM. That way a served agency could make a
> real TX call via a d-star connection.
> The only other way could like of being able to do this is via
> a DVDongle and some creative audio patching.
> The concept is to be able to get a call to PSTN via D-star.
John D. Hays
Amateur Radio Station K7VE <http://k7ve.ampr.org>
PO Box 1223
Edmonds, WA 98020-1223
VOIP/SIP: j...@hays.org <sip:j...@hays.org>
Email: j...@hays.org <mailto:j...@hays.org>
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