dialogic was RE: [Asterisk-Users] "Glare" condition - How well does asteriskhandle?

[Storer, Darren]

Hi Steve,

SU> If you are using CTR4, then I guess they use CTR4. :-)
SU> CTR4 ==  Net 5 == various other names == EuroISDN.

Reasonable logic but bad assumption in this case.

The Dialogic Q.931 stack (D/300, DM3 etc.) is solid and quite tolerant of
ISDN 85 as are most hardware PBXs. Other (PC based) products exhibit exactly
the same fussy behaviour though; the Digi RAS products (
http://tinyurl.com/36e7l ) work well with EuroISDN but won't work with ISDN
85 so the Asterisk stack is not alone in freaking when presented with this
"Frankenstein Protocol" of the ISDN world. (Thanks a bunch BT/Marconi/GPT et
al who rushed ISDN85 into service because they didn't want 18 months of
effort to delay real Q.931 deployment in the UK, so they bolted a protocol
converter on the end of existing DASS line cards instead of developing a
native solution...ugly stuff!)

I would like to try to help Tim decide which version of PRI he has as I'm
local to him, let's see if he takes me up on the offer to plug a working *
box into his PRI... Even if he has ISDN85 we would still benefit from the
chance to capture the failure (using an MPA) and compare it to some good
(working) * traces from a real EuroISDN circuit. Then the fun starts trying
to find a neat way to patch the stack...

Regards

Darren
--
Comgate
Telco>Internet<Broadcast


-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Steve
Underwood
Sent: 28 May 2004 01:39
To: asterisk-users at lists.digium.com
Subject: Re: dialogic was RE: [Asterisk-Users] "Glare" condition - How
well does asteriskhandle?


tim panton wrote:

> Steve Underwood wrote:
>
>> Jason Williams wrote:
>>
>>> At 09:16 27/05/2004 -0500, you wrote:
>>>
>>>> Maybe the time and effort would be better spent finding out why the
>>>> Digium card won't work on the NTL's PRI and either fixing it or
>>>> providing the information and testing facility to someone who can.
>>>
>>>
>>>
>>>
>>>
>>> NTL's PRI uses ISDN 85  not q931 so a ne protocol stack would need
>>> to be written.
>>
>>
>>
>> I think you means ISDN 85 not EuroISDN.
>>
>> Good heavens. I thought ISDN 85 died out in about 89. :-)
>>
>> I don't know where you would get the spec these days, but it
>> shouldn't be a lot of work to modify libpri to add another variant of
>> ISDN.
>>
>
> I should say that I don't _know_ what NTL are delivering me,
> I haven't (yet) tried it with a digium E1 card.
>
> What I do know is :
>     1) the dialogic card claims to be running CTR4 on an E1 ISDN PRI
>     2) other folks on this list have had difficulty getting digium
> cards to talk to NTL.
>     3) exactly the same dialogic config works on BT and the Dutch
> PTT's E1 lines.
>
> So it _may_ not be a problem for me as NTL is a patchwork of smaller
> telcos, my area (Manchester) may be more up to date.
>
> Anyone know an easy way to tell what I've got ?
> (or will I have to ask NTL -aaaagh)
>
> T.

If you are using CTR4, then I guess they use CTR4. :-)

CTR4 ==  Net 5 == various other names == EuroISDN.

It sounds like you are OK.

Regards,
Steve

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