Re: [Opalvoip-user] OPAL 3.14 vs. t38modem

[Robert J. <ro...@vo...>]

Did you compile the SpanDSP plug in?

If not, you won't have the transcoder to bridge the OpalT38 to PCM-16 gap
between modem ep and SIP ep.

Robert Jongbloed
*OPAL/OpenH323/PTLib Architect and Co-founder*.

On 4 January 2015 at 18:24, Henning Holtschneider <he...@lo...> wrote:

> Happy new year everybody,
>
> I'm trying to make my fork of t38modem compatible with OPAL 3.14. The
> current state of work is available at <
> https://github.com/hehol/t38modem/tree/opal314>.
>
> The modified code compiles and starts up correctly and I'm able to
> register with my SIP server. Unfortunately, I'm unable to make a successful
> call (neither SIP->modem nor modem->SIP) because there seem to be internal
> codec issues. The message coming from OPAL is:
>
> Call[C693736ba1] cleared (Call failed as could not find common media
> capabilities)
>
> If I understand correctly, the problem is an internal codec mismatch
> between the OpalEndPoint implemented in <
> https://github.com/hehol/t38modem/blob/opal314/opal/modemep.cxx> and the
> SIPEndPoint implemented in <
> https://github.com/hehol/t38modem/blob/opal314/opal/sipep.cxx>. The
> ModemEndPoint only supports the OpalPCM16 codec, whereas the SIPEndPoint
> supports OpalG711_ULAW_64K, OpalG711_ALAW_64K and OpalT38. With OPAL 3.10,
> no explicit transcoding was required for the connection to work but this
> doesn't seem to be the case anymore.
>
> Can anyone provide some help on what changes are required to get the call
> to work with OPAL 3.14?
>
> Thanks,
> Henning Holtschneider
> --
> LocaNet oHG - http://www.loca.net
> Baroper Straße 239 b, D-44227 Dortmund
> tel +49 231 91596-25, fax +49 231 91596-55
>
> Registergericht Amtsgericht Dortmund HRA 14208
> Geschäftsführer Sven Haufe, Henning Holtschneider
>
>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming! The Go Parallel Website,
> sponsored by Intel and developed in partnership with Slashdot Media, is
> your
> hub for all things parallel software development, from weekly thought
> leadership blogs to news, videos, case studies, tutorials and more. Take a
> look and join the conversation now. http://goparallel.sourceforge.net
> _______________________________________________
> Opalvoip-user mailing list
> Opa...@li...
> https://lists.sourceforge.net/lists/listinfo/opalvoip-user
>
>