[asterisk-users] OT - In which countries are ISDN subaddressesused ?

[Alec Davis]

When I say no reliable internet, some days it's good, others it's not, so to
try to push a call over an IAX trunk is going to fail.

For the choice of providers, when it comes to a business with branches
around the country (NZ is small enough) we'd choose one provider.

Subaddress is not limited to PRI, it's also available on BRI lines.

We have 2 PRI connected sites and 1 BRI ISDN site, all 3 with asterisk, and
non overlapping extension dial plans.
SITE A: 8500-8599
SITE B: 8800-8899
SITE C: 8300-8399

The flow goes something like this:
	Site A:
	8501 dials 8801
	dialplan sets CallingSubaddr to 8501
	dialplan calls SITE B's main number (perhaps 09 1234567) with
CalledSubaddr set to 8801.

	Site B:
	the main number (09 1234567) is processed by asterisk
	dialplan sees that CallingSubaddr is set to 8501, so sets CallerId
to 8501
	dialplan sees that CalledSubaddr was set to 8801 so dials 8801.

Regarding POTS it will not work, but some ISDN PABX's have the dialling
concept of dialling a '*' as the separator between Number and SubAddress and
'#' as end of dialling.

Alec Davis
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of C F
Sent: Tuesday, 29 September 2009 7:20 p.m.
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] OT - In which countries are ISDN
subaddressesused ?

On Mon, Sep 28, 2009 at 11:51 PM, Alec Davis <sivad.a at paradise.net.nz>
wrote:
> I'm interested, and I expect others will be on how you might use it.
>
> Our use on the mantis bug, is to allow 3 ISDN connected sites (no 
> reliable
> internet) each running asterisk, to dial other staff members in the 
> other


You say no reliable internet, if you can get ISDN wouldn't the providers
offer Internet thru the same ISDN Physical links? why are those not
considered reliable? What I mean is what we have here in the states called
Internet over T1, I know I am assuming that your ISDN links are T/E1 and if
that's not the case I know the answer is price.
But if it is T/E1 then I could see a fractional T/E1 where some channels are
used for data as a way better/easier/cheaper way than subaddressing.

> branches.
> The key to this working is the subaddress being populated with the 
> dailled extension, but the main number is called.

This is interesting, wouldn't the provider on both ends have to support
this?
While it could work with ISDN lines, I don't think it could ever work with
POTS, since the switches servicing these POTS lines have dialplans
programmed that after (US example) 7 digits - where the first digit is
something other than 0 or 1 and the next 2 digits are not 11 - it starts
calling not listening/taking any additional digits.
In the case where a 1 is dialed it's expecting 10 more digits with the first
3 having the same rules as the first 3 of the 7 digits, in an area where 10
digit dialing is required there is usually one more rule that where the
first 3 digits is the same as the area code of the phone making the call,
then it waits for 7 more digits with the first
3 of the 7 having the same rule as the 7 digit dialing above.
In any event you can't really dial more digits than the national dialing
plan when calling national from POTS here in the US.

>
> The dialplan see's the incoming call, checks the calledsubaddress and 
> then directs the call to the appropriate extension, all in a split 
> second. No IVR, no DDI.
>
> The natural answer is why not use DDI, that's one for each staff 
> member, could get a bit expensive.
>
> Alec
> ________________________________
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
> Sent: Tuesday, 29 September 2009 3:07 p.m.
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] OT - In which countries are ISDN 
> subaddressesused ?
>
>
>
> 2009/9/26 Alec Davis <sivad.a at paradise.net.nz>
>>
>> When did that happen? Added to libpri, someone beat me to it.
>
> Hello Alec,
>
> In this question, I was refering to your ongoing work I'm sorry if 
> this question let anyone believe this ISDN subaddresswas already done 
> and pushed into libpri trunk.
>
> Regards
>
>>
>>
>> Alec Davis
>>
>> ________________________________
>> From: asterisk-users-bounces at lists.digium.com
>> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
>> Sent: Saturday, 26 September 2009 9:06 a.m.
>> To: Asterisk Users Mailing List - Non-Commercial Discussion
>> Subject: [asterisk-users] OT - In which countries are ISDN 
>> subaddresses used ?
>>
>> Hi,
>>
>> I've seen this ISDN subaddress feature added to libpri.
>> Which countries are using it ?
>> How is this billed ? Do you have to pay an extra to your telco to 
>> benefit from this subaddresses ?
>>
>> Cheers
>>
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