[Freeswitch-users] MP2

[Michael Jerris]

Likely, you wont get full call setup, but you could see the inital setup message.  Alternatively, there is a way that you can setup some cards passive and you can tap and listen, depends on the hardware.

> On Jan 5, 2015, at 1:49 PM, Thomas Auge <auge at virtues.net> wrote:
> 
> These are hardware boxes. Can I capture the data with another ISDN card on the same BRI?
> 
> 
> On 05.01.2015 15:38, Michael Jerris wrote:
>> For any hope to achieve this we are going to needs some more info... preferably in the way of specifications.  It's
>> maybe possible if you can capture the isdn traffic from working equipment using this that you could decode it
>> (Wireshark does a decent job of this) and see what exactly its signaling.
>> 
>> 
>> 
>> 
>>> On Jan 5, 2015, at 1:34 PM, Thomas Auge <auge at virtues.net> wrote:
>>> 
>>>> To understand this a little better.  Is MP2 over data channel a standard that needs to be interoperated with?  Is
>>>> there details how this is signalled to the other side or are both sides just configured to support it?
>>> 
>>> Unfortunately I don't know. I didn't know there were multiple approaches to this. The currently implemented G722
>>> method works with these boxes, so the assumption was it's all the same with other codecs. If a data channel is not
>>> a common method to achieve this, then it's most likely not what they are doing.
>>> 
>>> 
>>>>> On Jan 5, 2015, at 1:06 PM, Michael Jerris <mike at jerris.com <mailto:mike at jerris.com>> wrote:
>>>>> 
>>>>> When g722 is used over isdn, it is a voice channel marked as g722, NOT a data channel with voice codec data.
>>>>> 
>>>>>> On Jan 2, 2015, at 5:20 PM, Thomas Auge <auge at virtues.net <mailto:auge at virtues.net>> wrote:
>>>>>> 
>>>>>> 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 at virtues.net
>>>>>>> <mailto:auge at virtues.net><mailto:auge at 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 at virtues.net
>>>>>>>> <mailto:auge at virtues.net><mailto:auge at virtues.net> <mailto:auge at virtues.net<mailto:auge at 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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