[Asterisk-Users] Re: Sipura 3000 Call waiting on the PSTN line

[altus]

OK
I have set the time and message
Luki writes: 

>> 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). 
> 
> I don't think I'm expressing myself clearly here; if not, please ask.
> Or correct me if I'm wrong. 
> 
> Luki
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