[Asterisk-Users] TDM0xB vs. SIP for FXO

[Walt Reed]

I've had issues with the FXO port on the spa3000 - banking apps could
not hear the DTMF. I've also had problems with phones hooked up to the
TDM FXS ports where banking apps hear DOUBLE dtmf digits.

The only mix that seems to work for me is SIP phones / or analog phones
hooked up to ATA's and TDM / x100P connections to the POTS line.

Frankly, this situation sucks. I've got half a TDM card that is
unusable, and half an SPA-3000 that is unusable. The SPA was really
attractive since it would have allowed for automatic powerfailure mode.
I dumped my X100P's since the telco tech showed me that it was
generating almost a direct short across the line according to his meter.
The TDM card doesn't have that problem. 


On Wed, Nov 02, 2005 at 11:45:20AM -0500, Rusty Dekema said:
> Hi,
> 
> I am planning to connect my Asterisk PBX to one or two POTS lines, and am
> wondering if it is better to use a TDM card for this, or one or two SIP
> devices with FXO ports on them (such as an SPA-3000, Grandstream 488). I am
> interested in voice quality and reliability of operation and am wondering if
> one of these options is better than the other in this regard.
> 
> Thanks,
> Rusty

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