[pjsip] is it possible to send raw data over pjsip via passthrough codec?

Bill Gardner billg at wavearts.com
Mon May 19 11:32:45 EDT 2014

PCMU is not lossless, because it is converting 16-bit to 8-bit and back 
to 16-bit. Try the L16 codec instead. - Bill

On 5/19/2014 11:20 AM, Brandon Wong wrote:
> Hi everyone, I need some help.
> I want to encode my own data not within pjsip then send it over to 
> another client
> and decode it not within pjsip.
> For an attempt to do this:
> 1) i filled up a "mem player" buffer with static data (eg. filled with 
> the char 'A')
> 2) i set the codec to PCMU/8000/1 (which should be a lossless passthrough)
> and also tried this with a custom codec that just copies the input to 
> the output for an effective passthrough...
> 3) i make a call
> connect the mem player to that call
> 4) on the other end
> i connect the call to a file writer
> the data that gets written is not the same as the buffer that i created.
> when i connect the "mem player" directly to the "file writer" within 
> the same app, i do get the results i am looking for.
> If anyone can offer some insights on why this is not working properly, 
> or an alternate route i should take... I would be very grateful!
> Thanks,
> Brandon
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