hello,
Signaling level need notify low level media engine what codec is using.
As you said, A uses pt 102 as iLBC offer, and B answer pt 109.
Your application could tell pjmedia stream to send out at pt
109, and receiving at pt 102.
As I remember, you can do this way
pjmedia_stream_info info;
info.tx_pt = 109;
info.fmt.pt = 102;
regards,
Gang
2011/10/27 Miguel Angel Ortu?o <miguelangel at yuilop.com>:
> But for receiving Payload there is no NAME identifier in RTP Packets, and
> so, you need to tell PJMedia that a certain ID like 105 is ilbc in clockrate
> 8000. An application cannot decide which ID the other endpoint will use for
> a certain dynamic payload. Isn't it?
> Regards.
>
> On Thu, Oct 27, 2011 at 6:22 AM, Benny Prijono <bennylp at teluu.com> wrote:
>>
>> 2011/10/26 Miguel Angel Ortu?o <miguelangel at yuilop.com>:
>> > Then you mean, for instance, that if an endpoint A offers a payload of
>> > type
>> > iLBC/16000/1 with an id value of 102 and an endpoint B responds offering
>> > the
>> > same payload but with an id of 109 this should be considered as a
>> > violation?
>>
>> No, this is legal, although not recommended by RFC 3264.
>>
>> I thought you meant an offer of ilbc/8000 with PT=102 which is
>> answered with the same PT=102 but different name, e.g. speex/8000. The
>> latter is illegal.
>>
>> > There's no way possible of establishing an id equivalence or translation
>> > between both endpoints? As far as i know iLBC has a dynamic payload type
>> > and
>> > there should exist some kind of mechanism to set a bridge between ids.
>> > Isn't
>> > right? Thanks.
>> >
>>
>> That's correct. For dynamic PT it's the name that matters, and pjmedia
>> should be able to handle it correctly.
>>
>> Cheers
>> ?Benny
>>
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