[asterisk-users] FXS + Pots Extensions Help

[Jeremy Mann]

Here's a silly question, if these are standard POTS you obviously know which number corresponds to which line, being the case couldn't you tell that ZAP/1 is POTS 555-1234, ZAP/2 is POTS 555-1235, etc etc?

I'm assuming you're trying to identify the inbound number from the telco that was dialed.  Unless you have the lines in a hunt group at the telco, but then you're implying you don't care which number was dialed, you just want failover at the telco.



-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rob Schall
Sent: Wednesday, May 23, 2007 8:19 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] FXS + Pots Extensions Help

We wanted a cheap last resort fail-over. A few really cheap pots lines
are easy to run buy, as we can get them for a really low cost. My
understanding with DIDs (and its limited), is they have to belong to a
PRI. The only way that is cheaper than a few pots lines is if you needed
8 or more pots lines. Then the line fees balance out.

I was hoping for a solution more along the lines of.... Use this "x"
variable that contains what ZAP channel it came in on, then I can
program that one to point to a particular person.

Thanks,
Rob

Sean M. Pappalardo wrote:
>
>
> Rob Schall wrote:
>> Normally I just use pri's with our asterisk systems, but a request came
>> in to add some normal pots lines to the setup. We have 3 lines, and they
>> run into the fxs ports. They hit the dialplan just fine, and they always
>> dial the "s" extension. However, my question would be... Is there a way
>> to determine what number was dialed and have it forward to a specific
>> phone?
>
> Sure, it's called a DID trunk. It's basically just a regular analog
> phone line but the CO switch sends down the digits dialed in one of a
> few ways: Dial pulse (DP), Multi-freq (MF), Dual-tone multi-frequency
> (DTMF). They are usually inbound-only, but some CO's can add outbound
> service too if needed. Call your phone service provider's business
> office and ask about analog DID lines/trunks. They should be around
> $30/mo for the line and $1-2/mo for each number. Ask them what type of
> signaling they use then you'll need to configure your zapata.conf to
> match. After that, you can then start routing in the dialplan based on
> the number called. For extra fun, have the CO set them up in a hunt
> group to avoid busy signals.
>
> Take a look at: http://www.voip-info.org/wiki-Asterisk+tips+DID
>
> (BTW, Why are you adding analog lines if you're already big enough for
> a PRI? Isn't it less expensive to just add a couple more DID numbers
> to the PRI?)
>
> Sean
>
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