[Asterisk-Users] R2-Digital (Q.421)

[Steve Underwood]

This seems to be what Cisco have implemented as r2-digital-dtmf-dnis. 
Cisco have quite a few other combinations of strange R2 related options. 
I can't imagine they are all really used. It seems this one is, though, 
in Venezuela

Regards,
Steve


Julio Arruda wrote:

> Just to clarify this in my head :-)..
>
> So...
> They are using E1/R2 (the R2 Digital)in fact, for all the line 
> signaling  (nothing unusual)
> The register signaling, that I was under impression would be MF in 
> each timeslot (MFC5C in .br, not sure if the same in others), is in 
> fact DTMF in this trunk, and only to provide DNIS ?
> (in Brazil R2, the register signaling has some collect call 
> information and etc).
>
> Steve Underwood wrote:
>
>> Hi,
>>
>> I tried hunting for a little more info. I think all that happens with 
>> this is they use the Q.421 spec for handling the ABCD bits, and then 
>> simply send the DNIS through as DTMF after the seize if acknowledged. 
>> That means they loose some of the functionality of real R2 signalling 
>> - e.g. no busy, NU, or congestion detection. It wouldn't take a lot 
>> of work to implement that.
>>
>> Regards,
>> Steve
>>
>>
>> Steve Underwood wrote:
>>
>>> Hi Jesus,
>>>
>>> The Cisco kit, and one or two other products, offer an R2 digital 
>>> using DTMF mode, but this is the first time I have heard of it being 
>>> used. The spec for this is definitely not Q.421. That spec does not 
>>> mention DTMF at all. R2 using DTMF doesn't appear to be in the ITU 
>>> specs, as far as I can tell. Without a spec, or any equipment to 
>>> play with, there isn't a lot I can do right now.
>>>
>>> Steve
>>>
>>>
>>> Jesus Mogollon wrote:
>>>
>>>> Hi Steve:
>>>>
>>>>  Thanks for your help. I really appreciate it..
>>>>
>>>>   My provider is CANTV in Venezuela. There's a venezuelan variant 
>>>> in the code and I'm using that. Incoming works perfectly, outgoing 
>>>> is not working. I'm being told that incoming is MFCR2 but outgoing 
>>>> is R2-Digital with DNIS DTMF. There is a Cisco router working and 
>>>> it's using the following:
>>>>
>>>> r2-digital-dtmf-dnis R2 ITU Q421 DTMF tone signaling with DNIS
>>>>
>>>>
>>>> What's the equivalent in libmfcr2 and Unicall?
>>>>
>>>> Again, thank you for your help and your code!
>>>>
>>>> Jesus Mogollon
>>>>
>>>> 2005/11/5, Steve Underwood <steveu at coppice.org 
>>>> <mailto:steveu at coppice.org>>:
>>>>
>>>>     Hi Jesus,
>>>>
>>>>     FX is not a variant of R2. It is a completely different signalling
>>>>     protocol. This means your service provider is using R2 for some of
>>>>     your
>>>>     channels, and providing all your incoming calls on those channels.
>>>>     It is
>>>>     use FX signalling for other channels, and you must make your 
>>>> outgoing
>>>>     calls there. Someone else told be about a similar configuration. I
>>>>     think
>>>>     they were able to use chan_zap for the other channels, and make
>>>>     use of
>>>>     its FX signalling features. I am not sure how that works, as FX
>>>>     signalling over E1s is far from standardised.
>>>>
>>>>     Regards,
>>>>     Steve
>>>>
>>>>
>>>>     Jesus Mogollon wrote:
>>>>
>>>>     > Steve:
>>>>     >
>>>>     >   That's exactly what I'm using. Incoming calls work like a
>>>>     charm but
>>>>     > when I try calling I get a protocol error. My provider says 
>>>> that for
>>>>     > outgoing I need to use fx signalling. I see that in unicall.conf
>>>>     > there's such a thing as protocolvariant=fx but if I uncomment 
>>>> that
>>>>     > line, unicall gives me an error. Any ideas? Thanks for your 
>>>> help...
>>>>     >
>>>>     > 2005/11/4, Steve Underwood <steveu at coppice.org
>>>>     <mailto:steveu at coppice.org>
>>>>     > <mailto: steveu at coppice.org <mailto:steveu at coppice.org>>>:
>>>>     >
>>>>     >     Jesus Mogollon wrote:
>>>>     >
>>>>     >     >Does anyone know how to make this work with Asterisk?
>>>>     (R2-Digital
>>>>     >     >(Q.421)) I have MFCR2 configured but I'm told that outgoing
>>>>     calls are
>>>>     >     >to use Q421 R2 Digital signalling. Any help is appreciated.
>>>>     >     >
>>>>     >     >Jesus Mogollon
>>>>     >     >
>>>>     >     >
>>>>     >     See http://www.soft-switch.org <http://www.soft-switch.org>
>>>>     >
>>>>     >     Steve
>>>>