[Users] codec translation

Atle Samuelsen clona at cyberhouse.no
Thu Feb 15 12:10:41 CET 2007


* Daniel-Constantin Mierla <daniel at voice-system.ro> [070215 12:09]:
> Hello Atle,
> 
> On 02/15/07 13:04, Atle Samuelsen wrote:
> >Hi Again Stefano,
> >
> >Me and Stefan Sayer made a patch to rtpproxy and to nathelper module in
> >ser, so it changes the sdp, and do transcodeing. It works, but it has a
> >few bugs in the nathelper code atleast, and it needs atleast a function
> >to check codecs etc. 
> >but, on the other hand.. we have had a few calls over it, and it seems
> >to work rather Ok when my nathelper patch does'nt crash ser :-)
> >
> >So, if anyone is willing, they can proberbly get to adopt the code, and
> >productify it.   
> could you upload the patches to the tracker? It sounds very useful in some scenarios. We will have a look and make sure that 
> the patch for nathelper gets very well integrated in existing code. Here is the link to the tracker:
> http://sourceforge.net/tracker/?atid=743022&group_id=139143&func=browse

I would very well like that the person who takes take code. would also
update it so it still works with trunk ser. (Atleast for now) Is this
something you can do Daniel ? 

- Atle

> 
> Thanks,
> Daniel
> 
> >So alittle status on the code: 
> >The code was written for SER trunc about half a year ago. The nathelper
> >part is written by me, who does'nt do C very much, so that part is very
> >flacky. but as a proof of concept it works. 
> >There is a need of a function as decribed above that can check what
> >codecs the UA supports.
> >
> >
> >- Atle
> >
> >* Stefano Capitanio <s.capitanio at caspur.it> [070215 11:52]:
> >  
> >>Hi,
> >>
> >>we would be very interested! :-)
> >>I think it's a great idea but...what do you mean with "very simple" ?!
> >>
> >>Stefano
> >>
> >>Atle Samuelsen ha scritto:
> >>    
> >>>Hi Guys,
> >>>
> >>>Just qurious.. How intrested are you guys in a very simple transcoder,
> >>>wich is based on rtpproxy ? - Atle
> >>>
> >>>* Andreas Granig <andreas.granig at inode.info> [070215 11:09]:
> >>>       
> >>>>Hi,
> >>>>
> >>>>rtpproxy and mediaproxy do media-relaying and OpenSER does SIP routing. Both have nothing to do with codecs, which are 
> >>>>negotiated end-to-end. So yes, OpenSER and rtpproxy/mediaproxy do support G729 in a sense that they allow UACs to 
> >>>>communicate with G729. If you want to transcode between codecs (e.g. G711 <-> G729), you need - as Daniel already said - 
> >>>>a transcoder like Asterisk.
> >>>>
> >>>>Andreas
> >>>>
> >>>>raviprakash sunkara wrote:
> >>>>           
> >>>>>Hello Daniel ,
> >>>>>I'm Also Having the Same doubt on g729 Codec,
> >>>>>I'm  using RTPproxy with Nathelper ,
> >>>>>OpenSER and RTP proxy does  media signaling when the Call is Established,
> >>>>>My main question is
> >>>>>Is RTP proxy support the G729, with OpenSER,
> >>>>>With out using the Transcoder ( Asterisk ) How can OpenSER signals the G729 Codec.
> >>>>>On 2/15/07, *Daniel-Constantin Mierla * <daniel at voice-system.ro <mailto:daniel at voice-system.ro>> wrote:
> >>>>>  Hello,
> >>>>>  you need a transcoder in the middle. OpenSER does only signaling, so it
> >>>>>  is not able to transcode. Asterisk, for example, does.
> >>>>>  Cheers,
> >>>>>  Daniel
> >>>>>  On 02/15/07 10:57, tusker keg wrote:
> >>>>>   > Howdy
> >>>>>   >
> >>>>>   > I have a situation  I hope you guys will help me out with
> >>>>>   >
> >>>>>   > I am receiving  call from a VOIP  peer  (SIP Call) and the peer can
> >>>>>   > only send them as G711.
> >>>>>   > I need to redirect to call to another voip peer over the wan and due
> >>>>>   > to bandwidth considerations I need to translate the codec to g729.
> >>>>>   >
> >>>>>   > Any ideas on how to do this,
> >>>>>   >
> >>>>>   > Sample config file will be help
> >>>>>   >
> >>>>>   > Regards
> >>>>>   >
> >>>>>   > ./Tusker
> >>>>>   >
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> >>>>>-- 
> >>>>>Thanks and Regards
> >>>>>Ravi Prakash Sunkara
> >>>>>ravi.sunkara at hyperion-tech.com <mailto:ravi.sunkara at hyperion-tech.com>
> >>>>>M:+91 9985077535
> >>>>>www.hyperion-tech.com <http://www.hyperion-tech.com>
> >>>>>Client and Parent company :- www.august-networks.com <http://www.august-networks.com>
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