[Asterisk-Users] Re: RES: Working E1 MFC/R2 M?xico !!! (Steve Underwood)

[Julio Arruda]

Remarks inline:

Steve Underwood wrote:
> Julio Arruda wrote:
> 
>> Miguel wrote:
>>
>>> Steve,
>>>
>>> Do you know if there are many differences between the Mexican and 
>>> Brazilian
>>> variant ?
>>>
>>> Kind regards,
>>>
>>> Miguel Antonio
>>
>>
>>
>> For one, the 'collect call without operator' signaling that exist in 
>> Brazil R2, I don't think is used anywhere.
>> Could of course, be implemented (a kludge) with a "answer/hangup/answer"
>> I think it was called "double-answering" or something like that.
>> [], <O-O>
> 
> 
> For about 20 others look in my code :-) Every country requires quite a 
> few of the functions reallocted to different tones. There are also 
> features, like "send me digit N - 3", which may or may not be available 
> in any particular country. Mexico is messy, as they introduce a complete 
> new group III/group C section to the codes.

The joy of Blue Book 'extensions ;-) ?

> The featuer you describe is one I don't know about. It isn't in the 
> documentation I have, and  don't thing people like Dialogic and NMS have 
> it in their implementations. Can you say more about what is supposed to 
> happen?

I don't have Brazil E1/R2 specs (few years since I worked with that).
The bottom line is that in Brazil, you can do a collect call with some
specific prefix dialed before (9?), and the remote end phone would play
to the called number an announcement "this is a collect call from " (the
calling person would speak their name them, being given of course the
proper announcement also)" hangup now if you don't want to accept this
call".
The called person would just hangup (or not).
In E&M trunks, this similar behaviour would be done in PBX with
"off-hook, on-hook, off-hook" with specific timers. That is how old
times ISPs would refuse collect calls for their modem banks :-), and PBX
also. (non-collect calls would not be dropped with this trick if the
public switches  had the proper configuration).
Notice that in Brazil calls are charged per minute (even local calls),
so...(still so I think)
In E1/R2, the "telebras 1996" standard would have some A/B codes for
that, where the PBX would refuse calls also with E1/R2 signals (really
don't remember the specifics).
The gotcha (at least in 1998 or so) was that many public telco switches
DIDN'T suppor the E1/R2 1996 feature for that collect call
'refusal/acceptance' codes, so, even in E1/R2 you would do the
off/on/off trick to refuse collect calls.
Anyone from Brazil would have these details about the E1/R2 specs ? I'm
sure is part of requirements for any company there the "collect call"
thing...
[], <O-O>