[Asterisk-Users] Re: Connection TDM400P to UK PSTN

[Roger Hill]

Chris:

I had the same problem and gave up. (Gloucestershire)

If I have the gains right down low (just enough so that the DTMF tones 
are recognised), the echo is acceptable, but audio at the far end is 
very low.

I think that forwarding my POTS line to the VOIP line is the only 
sensible option, or back to my original thought of using an SPA3000.

BTW, I tried building a matching network, briefly, but failed with that too.

For the moment, I'm just using Asterisk for VOIP - but very pleased with 
that.

Roger

Chris Earle (CBL) wrote:

>Okay, sorry to hash out this discussion again, but it's starting to drive me
>crazy
>
>Successfully got the adapters to allow the BT phones to ring on lines coming
>out of a TDM.......... but now my latest problem is echo.
>
>I have done tweaking of the gains in North and South America, and after a
>bit of work have gotten echo to go away, but this seems to just not want to
>go away.
>
>On an incoming call from the POTS, everything on my end sounds perfect,
>but on the internal extension phone, there is an echo when you speak.  An
>almost perfect copy of what you say.  If I turn down the gains on that
>channel, it doesn't seem to do much, or causes other volume issues.
>
>Help!
>
>In my research and hunting, I am starting to worry that the US-bought digium
>cards have IMPEDENCE issues in the UK with the BT Lines etc?  That would
>seem to explain why the echo is so incessant.  I have even tried changing
>Echo Cancellers to MARK3.
>
>Right, this is Asterisk 1.0.9, Zaptel 1.0.9.2 on Debian
>
>Suggestions / Experiences in UK appreciated
>
>
>--
>Chris Earle
>System Solutions Specialist,
>
>----- Original Message ----- 
>From: "John Novack" <jnovack at stromberg-carlson.org>
>Newsgroups: gmane.comp.telephony.pbx.asterisk.user
>Sent: Wednesday, August 24, 2005 10:03 AM
>Subject: Re: Connection TDM400P to UK PSTN
>
>
>  
>
>>The jacks on the TDM are ( incorrectly ) referred to as RJ45, correctly
>>they are 8 position modular.
>>The line, either in or out is on the two CENTER pins. NONE of the other
>>6 pins are used.
>>Though I am not in the UK, from what I know you don't use the two center
>>pins for a single line connection, so you will need to fashion some sort
>>of adapter to connect. Frankly, using the two center pins ( A Bell
>>System brain blizzard) wasn't the smartest idea. It makes the modular
>>plug into, with the addition of just a little moisture, a really good
>>spark gap when a ring signal or small induction of lightning is applied.
>>I have seen many a modular plug turned black and useless  since the
>>introduction of modular in the US in the early 70's
>>
>>Good luck
>>
>>John Novack
>>
>>
>>Graham Kiff wrote:
>>
>>    
>>
>>>I'm a complete Asterisk novice and have an installation based on the
>>>Asterisk at Home <mailto:Asterisk at Home>CD.
>>>
>>>I've installed my TDM400P with 2 x FXO & 2 x FXS, but every time I try
>>>to dial out, I get a message "No circuits available".
>>>
>>>Can someone confirm the pinouts for connecting the FXO's to a UK BT
>>>Line - I have RJ11 connectors on the back of my TDM400P card, so
>>>ideally I'd like to know the pin mappings from a standard BT plug to
>>>      
>>>
>RJ11.
>  
>
>>>Cheers
>>>Graham
>>>
>>>------------------------------------------------------------------------
>>>
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>>    
>>
>
>
>  
>

-- 
########################################################
Roger Hill				07739 707 180
Perseverance is the hard work you do after you get
tired of doing the hard work you already did.
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