Luki wrote:
Has anybody been able to get call waiting on the PSTN line?
As far as I recall, you will only hear a tone in the audio stream when
a second call comes in. The Sipura does not detect or handle it, but
if you flash the line on the FXS interface after hearing the tone, the
Sipura will forward the flash to the FXO interface and hence switch to
the second call. I am positive this works when the call is picked up
on the local FXS port but I am not sure if it also works when the call
is picked up by a remote device.
This is how I had set it up:
PSTN -> FXO on Sipura 3K -> Asterisk (remote via DSL) -> FXS on Sipura
3K -> Phone
The call would be re-invited in this case so no RTP traffic goes via
DSL, only SIP traffic. Switching to second call with flash works in
this scenario. Additionally I also allowed the call to be received by
a remote device (RTP via DSL) but I am not sure if you can then use
Call Waiting (never tried it).
The flash in the above is intercepted and used by the spa3k, and is
typically used by the sipura for its implementation of special features.
The flash is not forwarded to the pstn line unless one programs the
spa3k to operate in a different mode.
Sipura added a configuration option (I think it came out in v3.1.7 code)
that allows one to program a double-hook-switch-flash that is forwarded
to the pstn line.
In the OP's config, asterisk is in the middle of the call, therefore
something would need to be configured in asterisk to handle & generate
the flash to the pstn interface. But, I've not tried or even researched
how that might be accomplished.
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