There are ISDN devices which establish a digital (data) ISDN connection and then use all kinds of codecs on top of that.
Think FreeTDM with G722 - same thing. As far as I know FreeTDM doesn't care which codec you choose for a digital
connection. G722 is just the most common use case.

MP2 is still a widely used standard in broadcast, i.e. for remote contributions.

On 02.01.2015 19:08, Brian West wrote:
> I'm still puzzled as to why mp2, since ISDN is native PCM (ulaw/alaw), Do you have some legacy files or systems you're
> working with that require this?  Trying to fully understand your thought process and needs.
>
> On Fri, Jan 2, 2015 at 4:04 PM, Thomas Auge <auge@virtues.net <mailto:auge@virtues.net>> wrote:
>
>     Digital ISDN calls, so I think as far as freeswitch is concerned, voice calls, yes.
>
>
>     On 02.01.2015 18:52, Brian West wrote:
>     > In what context?  playing sound files, voice calls what?
>     >
>     > On Fri, Jan 2, 2015 at 3:49 PM, Thomas Auge <auge@virtues.net <mailto:auge@virtues.net> <mailto:auge@virtues.net <mailto:auge@virtues.net>>> wrote:
>     >
>     >     Hello list,
>     >
>     >     would it be a big task to add mp2 (transcoding) to freeswitch? What would be a realistic bounty for it?
>     >
>     >     Cheers!
>     >
>     >     Thomas
>     >
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