The spa3102 is "fine" for outbound calls and its certainly cheap. It also has a
failover relay so you can have an analog phone plugged into the fxs side and if
the power goes out it will bridge the fxo to the fxs.
All the (many and ultimately fatal) problems I had were related to malformed
headers causing trouble on inbound call (things going thru the AA). I also
never got it to detect CPC inbound so I had to build a little DSP 'busy tone'
detection string that matched the PBX FXS line I was testing with. It didn't
detect CPC from raw telco either but the default north america busy signal
detection did work (you would just get 2 seconds of busy signal at the end of
every voicemail).
You do have to be careful about DTMF signalling, it hardcodes the RTP code for
telephony events as 101 (if I recall) and the default polycom/sipx config ends
up trying to use 127 -- the SPA allows the negotiation but then just doesn't
send DTMF.
Also, in the outbound direction: getting it to recognize the idle loop voltage
from a PBX I was testing with required configuration. The pbx only put out 24V
when idle and by default that wasn't enough to make the SPA3102 think there was
an FXS present (but there's a configuration setting for that). The debugging
(via syslog only) is very rudimentary but better than nothing.
Despite being unsupported by Cisco and non-SIP standard compliant (broken at
the protocol level) it was stable for the 3 months I was testing with it (never
crashed or did anything flakey).
If I had your requirement ("outbound calls, emergency line, cheap") the SPA3102
seems pretty appropriate.
-Eric
On Feb 6, 2010, at 1:51 PM, [email protected] wrote:
> Anyone have a single port FXO they like? It is for emergency outbound
> calls only. No inbound. I'm familair with the products from Audiocodes
> and Patton, but I would love to find a cheaper single port option if
> there is one out there that is compatible with sipx. From what I have
> read, I'm assuming none of the actual PCI card options are compatible
> with sipx. That would be really cool if there was one that would work.
> I'm going for simplicity and affordability. The spa3102 is cheap, but I
> don't seem to find much in the way of success stories with it and sipx.
> Any tips would be greatly appreciated.
>
> Thanks,
> Matthew
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