[Asterisk-Users] PSTN Incoming call on real line disrupts VoIP call over DSL circuit - EXPLAINED

[Juergen K. Zick]

Well,

to avoid a misunderstanding see the following drawing:



                                             /-------DSL-MODEM-----HT-----PC
                                            H|                      |
                                   +----------+                   Inet-PHONE
from BellSouth (DSL over POTS) ---| SPLITTER |
                                   +----------+
                                            L|
                                             \------------------------------
                                                         |                 |
                                                     answering            POTS
                                                     machine              phone



(maybe you have to reformat it into COURIER font)

It's depending on the calling in your father`s flat but on the incoming 
line you should have only _ONE_ device, the SPLITTER !!!

maybe your dad can try that ...

All DSL connections in Germany are build up like that and I have not seen 
any that did _not_ work with this cabling ...


--Jürgen




>Juergen K. Zick wrote:
>>HI,
>>well, that was what I expected in my posting yesterday. For me, your 
>>wiring looks strange. Here in Germany, we have "spiltters" connected to 
>>the incoming line which have two outputs: A high pass filter output for 
>>the DSL signal and a low pass output with DC  pass-through for the POTS 
>>signal. the DSL output is being connected to the DSL-modem and the POTS 
>>output will feed your internal POTS wiring.
>
>The only jack that has both a phone and the DSL connector indeed has a 
>splitter on it, provided by Bellsouth.
>
>>Therefore, there is _NO_ filter needed on each POTS outlet, because there 
>>is nothing to be filtered out on your internal line anymore.
>
>You may be correct. I am definitely _not_ familiar enough with DSL. 
>However, 5 years ago, I had a DSL line in my apartment, and I was 
>specifically told by the installation tech that I needed a filter on _any_ 
>jack that had a real phone connected to it. That may not have been 
>necessary, or perhaps isn't necessary any longer, or perhaps varies by 
>provider, but that's what I was told at the time, and that's what I did 
>(with no problems).
>
>The filters on the phone jacks that didn't have the modem connected were 
>not splitters, just single filters.
>
>>Seen from my German wiring knowlegde, your cabling is wrong and causes 
>>the interruptions on the DSL service.
>
>That's definitely possible, just not my personal (single point!) experience.
>
>>Don`t you have something like a "spiltter" available ? It should be the 
>>_ONLY_ filter on your incoming line and then the DSL-modem and the POTS 
>>phone should be connected to it ...
>
>OK, it would be easy for him to remove the other filters temporarily and 
>test again.
>
>Thanks!
>
>>--Jürgen
>
>>>Replying to my own post (and my most recent follow-up). I have now 
>>>confirmed 100% that the DSL modem gets a _new_ IP address every time his 
>>>"real" phone gets answered, or hung up! This (of course) disrupts the 
>>>audio coming from to him, since the sending machine (Asterisk in my 
>>>case), no longer has the correct IP address to send to him.
>>>
>>>I lowered his registration from the default 1 hour to 1 minute, so after 
>>>we're disconnected, I can see that he's re-registering with a new IP 
>>>address, each and every time :-(.
>>>
>>>I told him to call Bellsouth and ask about a Static IP address, but I 
>>>don't know if they offer it, or how much they charge.
>>>
>>>While this one isn't "solved", it's at least "explained".
>>>
>>>Thanks to everyone who responded!
>_______________________________________________
>--Bandwidth and Colocation provided by Easynews.com --
>
>Asterisk-Users mailing list
>To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users