SPA-3000 Analog Telephone Adapter ?

[Guest]

Archived from groups: comp.dcom.voice-over-ip (More info?)

Would like to know that can SPA-3000 Analog Telephone Adapter foward
incoming VOIP calls to a cell phone using PSTN phone line connected to
it automaticallly without any delay or loss of quality . And would it
disconnect the call automatically if the reciever of the call on cell
phone disconnects the call or is there a possibality of whole system
hanging inbetween at times when the person on cell phone disconnects
the call .


--
SIP2PSTN

 

[Guest]

Archived from groups: comp.dcom.voice-over-ip (More info?)

SIP2PSTN wrote:
> Would like to know that can SPA-3000 Analog Telephone Adapter foward
> incoming VOIP calls to a cell phone using PSTN phone line connected to
> it automaticallly without any delay or loss of quality .

Yes, it can, although delay and quality may be affected by the latency
of the VoIP connection. Anyway, I've been using for several months,
without any problem, a setup based on a free DID account in Europe
placing calls to the Sipura SPA-3000 in my home in Hong Kong, which in
turn has a dialplan resulting in a straight call to my cellphone.
Callers say they are surprised by how good the quality of the
conversation is.

On the other hand, I haven't been able to get good quality if I forward
the incoming VoIP call to a PSTN destination through a PSTN termination
provider, using an Asterisk PBX in the middle: there is always a lot of
echo. I suspect that the gateway tunes its echo cancellation on the
delay of the first leg of the call (DID No. to PBX), and when the PBX
bridges it with the second leg (PBX to PSTN termination) the overall
delay is very different, screwing up the echo cancellation. If someone
got this working, please let me know how.

> And would it
> disconnect the call automatically if the reciever of the call on cell
> phone disconnects the call or is there a possibality of whole system
> hanging inbetween at times when the person on cell phone disconnects
> the call .

It never happened to me: so far, everything works like a charm. If you
want to do a test, contact me by e-mail at em ~at~ em ~dot~ no-ip ~dot~
com, and I'll send you my European DID number, that you may call with
normal IDD after we make arrangements about the time (as you are in the
GMT+1 time zone, this would fall in your morning time: in summertime
I'm six hours ahead of you).

Enzo