[VoIP] DP-compatible ATAs

[Chad Perkins]

On 29 Dec 2006 at 21:01, Steph Kerman wrote:

> Chad Perkins wrote:
> > Holy crap. What does one do with 100 DIDs?

> 20 numbers were 3X the price of 100 numbers so 100 seemed to make more
> sense.  40 are assigned to EXTs on my PBX. The other 60 are on my
> intercept. 

Wow.

>> And what do you terminate them on? 

> A crossbar PBX. 

Yes, but how?  T1, E&M, 1B/1Rs?

>> I can understand that, however Asterisk nativity will not add nor 
>> remove outpulsing "sounds"; whatever goes in one end comes out the
>> other ...: 

> Asterisk DP outpulsing will not produce authentic sounding
> DP towards the caller as was generally heard for DID completions to
> SXS Centrex-CUs.  While it may not mask it, if the wirespring DP
> sender has to be there anyway to produce authentic sounds, the *
> becomes dispensible for this purpose.  And the W-S senders are
> infinitely more fun to watch! 

My assertion is that Asterisk (natively) will behave the same as any modern PBX.  If I 
have a Definity or a Nortel I'm not going to hear anything different as the call is 
routed through the switch.  I do understand, and agree that if everything is on analog 
2W copper and "historic" sound is important, Asterisk does not contribute to that end.

>>> True but I believe that machines that inherently have metallic 2W 
>>> trunks should be connected directly together and not go back and 
>>> forth between 2W analog and 4W digital any more times than necessary. 

>> That's your choice. Although I know it can be done, no one I know is 
>> doing 4W on Asterisk. 

> I think you missed the point.  * is inherently 4W.  Therefore any 2W analog line
> or trunk termination involves a 2W/4W and 4W/2W conversion. 

A, as in one.  Yes I agreed with that, however your post above mentioned a short 
coming in CNET of having to 'go back and forth between 2W analog and 4W digital 
any more times than necessary', to which I noted that normal PSTN calls have a 
2W/4W/2W conversion too.    

> The monthly cost for
> bringing in a T1 to have the DID delivered digitally is completely
> unjustifiable. 
[big snip]
> Ah!  Apparently you are confusing DID #s and DID trunks.
>  I have 100 DID # terminating on a trunk group consisting of 1 trunk. 
> If I had 100 DID trunks it certainly would be cheaper to have 4 or 5
> T1 spans.  I could not possibly afford that.  It would be pointless
> for these hobby purposes.

Oh that's a horse of a different color!  

I have never heard of NYNEX/Bell Atl/Verzion doing that before; except as Distinctive 
Ringing on analog lines!  This brings me back to a question above; what type of line 
is this?  Can/will they do this on 1B?  I can see how this could be done on a old 
fashion E&M type trunk, but I haven't seen one of those (except in books).

Sorry for the misunderstanding.
Chad