[Asterisk-Users] Reccomendations for connecting to 3-4 PSTN lines?

[C F]

In my experience if you can get an external device to do the PSTN <>
SIP for you, like an ATA, then it works much better than the Digium
TDM400 cards. If you don't mind the extra ~$200 just go for it. The
other option might be a channel bank (like the ADIT 600) and a Digium
T1 card. This will let you use up to 24 FXO/FXS per 8 lines to a card
(they can be mixed FXS and FXO), but again this will have Asterisk do
the transcoding (if any) from ulaw to 729 or whatever, which is usualy
much better to do before it reaches Asterisk.

On 6/1/05, Ivan Fetch <voip at ivanfetch.com> wrote:
> Hello,
> 
>   I'm looking to connect Asterisk with three (four in the future) PSTN
> lines, and would like to get some opinions on the TDM400 Digium card, vs.
> sip gateways like the Mediatrix 1204, vs. other hardware solutions I'm not
> yet aware of.
> 
>   I need the ability to prioritize which PSTN lines are used for outgoing
> calls (I understand this can be done with the Mediatrix --
> http://lists.digium.com/pipermail/asterisk-users/2004-February/035926.html),
> and only answer two of the three lines (the third line will be answered by
> a directly connected FAX machine, but we can use that line for outgoing
> calls if the first two PSTNs are in use).
> 
>   Does the higher cost of something like the Mediatrix ($634) bring
> advantages to the table over the TDM04b ($337)?  Does the TDM card provide
> functionality which the sip gateways do not (e.g. incoming / outgoing call
> progress)?
> 
> I appreciate hearing from folks who have experience with both methods of
> connectivity,
> 
> Thanks - Ivan.
> 
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