Subj : Weekly nodelist report on noteworthy changes (238)
To   : Torsten Bamberg
From : Michiel van der Vlist
Date : Wed Aug 31 2022 09:25:06

Hello Torsten,

On Saturday August 27 2022 00:54, you wrote to me:

 MV>> I am a bit puzzled about the added value of ISDN for Fido. It is
 MV>> my understanding that all that is left of ISDN is some kind of
 MV>> "ISDN over IP". Some of the older Fritx!Box models seem to offer
 MV>> this, so that one can still use old ISDN equipment at home, but
 MV>> the feature is dropped in the newer models.

 TB> Nope, in this case you are misinformed. Fritz!Box's at all support
 TB> G.711u, which is 64000 kbit, also called 'hd telephonie'. But only
 TB> newer ones are powerfull enough, to decode/recode G.711u on data
 TB> streams.

So they support G.711u. But The New Fritzbox from Kees van Eeten no longer has the ISDN P0 bus. So one can not use local ISDN equipment. Isn't that an indication that according to AVM ISDN has reached end of life?

 TB> Just for your knowlege-base; X75 over IP works with G.714raw, if both
 TB> receiver and sender support RFC4040. Because german telekom does
 TB> support RFC4040 on rtsp raw and G.714raw, X75 is a valid flag with a
 TB> phonenumber.

OK, so X75 it is a valid nodelist flag. But so is V22...

 MV>> To me it seems even more inefficient as a means of transporting
 MV>> data than analog modem over VOIP.

 TB> I didn't find any ftsc proposals about the efficiency of connections.

Indeed, there is no such proposal. But why would anyone want to use an inefficient means of transporting data when an efficient means is available?

I am still puzzled about the added value of using ISDN over IP for Fido. I can see two reasons for advertising ISDN as an alternative way of connection in the nodelist:

1) As a fall back in case the "normal" connection fails. In the case of ISDN over IP, this fails. If the IP connection is down, the ISDN over IP is also down. It is not an independant means of connection, so it is useless as a fall back.

2) During the transition fase. When there are still nodes around that only support "classic" ISDN and that have no IP connection. ISDN over IP can be used to connect with these nodes. But that will end at the end of the year when German Telecom shuts down "classic" ISDN. And maybe if the dead wood is cleared from the nodelist, that situation already exists now in R24.


Cheers, Michiel

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