Hi Lucas, I don't think that ptime attribute is to be negotiated, please see: RFC 3264 Section 5.1: If the ptime attribute is present for a stream, it indicates the desired packetization interval that the offerer would like to receive. RFC 3264 Section 6.1: The answerer MAY include a non-zero ptime attribute for any media stream; this indicates the packetization interval that the answerer would like to receive. There is no requirement that the packetization interval be the same in each direction for a particular stream. BR, nanang On Fri, Oct 2, 2009 at 6:38 PM, Lucas Tehbing <lucas_mvoip at hotmail.com> wrote: > I added following code to set ptime in SDP > > pjmedia_sdp_attr > > *a; > > pj_str_t value; > > pjsua_var.p > > value = pj_str( > > "40"); > > a = pjmedia_sdp_attr_create(pool, > > "ptime", &value); pjmedia_sdp_attr_add(&sdp->attr_count, sdp->attr, a); > > This added ptime as 40 in INVITE SDP but in Session Progress and 200 OK i > receive ptime as 30. Does that mean ptime is being negotiated? > > Benny can you comment on this? > > Cheers , > > Lucas > > > > ________________________________ > Date: Fri, 2 Oct 2009 13:21:32 +0200 > From: tal.fromm@xxxxxxxxx > To: pjsip at lists.pjsip.org > Subject: Re: Payload size change > > I had the same problem with other codec speex/8000. > The server that connects the call will send packet size as it's default > value, but if both client side are set to the requested payload size, and > the server only passes the packet between them you should be fine. > In other post I saw that for now it was selected not to send the payload due > to different codec support. I'm still learning how to add attribute to the > message, and then I will be able to send the ptime setting. Of course the > other side must support SDP message and work with it. > If you know how to do that you can try it, and please share the info with > me. > Good luck, > Tal > On Fri, Oct 2, 2009 at 7:44 AM, Lucas Tehbing <lucas_mvoip at hotmail.com> > wrote: > > Sorry for getting back late. > I have verified this. I configured codec ptime as 40 and compared packet > sizes (g729). Complete outgoing packet is 52 (12+40) which is correct. But > incoming packet is still 32 Bytes (12+20) this indicates that end callee > does not know it has to send 40 Byre RTP payload. > > In this case there was no Ptime in SDP. I had seen Ptime in dump before but > now i do not see it. > > Another doubt arises (i checked old posts on this matter also). Codec ptime > is a codec property i think but in pjsua its public. > > Is there any way to make sure end callee can be conveyed that it will use > different ptime? > > How can we change it at codec level direcly? > > Cheers Lucas > > > > > ________________________________ > Date: Mon, 28 Sep 2009 21:42:54 +0200 > From: tal.fromm@xxxxxxxxx > To: pjsip at lists.pjsip.org > Subject: Re: Payload size change > > G729 is compressing 10msec voice to 80bits of data. > I don't use G729, but if you found a way to set the SDP "ptime:20" value to > be "ptime:40" and you set your configuration ptime=40 than it should work. > I tried it with speex, setting ptime=100 (5 payload in one RTP), but I > didn't see SDP with value "ptime:100". > The value you set to ptime should be multiply of the basic value the coder > support. > In G729 it should be x10ms, but it could be that the codec implementation, > in this case rap the data as?20ms. > Hope it helped you, and if you can direct me to the SDP setting it would be > great. > > On Mon, Sep 28, 2009 at 2:38 PM, Lucas Tehbing <lucas_mvoip at hotmail.com> > wrote: > > There is one more point. I was reading APS documentation, they sayg729 data > is sampled?for 10 ms. If we increase RTP payload does that mean g729 output > should also be 20 ms ? or RTP payload can be increased with existing > settings only. > > cheer, > > Lucas > > ________________________________ > From: lucas_mvoip@xxxxxxxxxxx > To: pjsip at lists.pjsip.org > Date: Sun, 27 Sep 2009 09:15:32 +0100 > Subject: Re: Payload size change > > Yes that is what i want to try. Two?payloads in one RTP. Theoritically we > can two three 4 any amount of payload in one RTP packet right? > In the Invite i see one SDP parameter ptime:20.?Is this the way it can tell > other endpoint about payload?or it sends. or it is done using frame header > of g729? > > > ________________________________ > Date: Sun, 27 Sep 2009 07:40:00 +0200 > From: tal.fromm@xxxxxxxxx > To: pjsip at lists.pjsip.org > Subject: Re: Payload size change > > If I understand your question you want to get 2 payload packets sent in one > RTP. > You can do that with setting ptime=40. > The problem is that as far as I saw pjsip doesn't send this info to the > other side, and it the other side is not set to the same packet size you > won't hear good. > > On Sat, Sep 26, 2009 at 5:52 PM, Manoj Joshi <manoj at ascenttelecom.com> > wrote: > > Any comment? > > -----Original Message----- > From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org]On > Behalf Of Lucas Tehbing > Sent: Saturday, September 26, 2009 3:21 AM > To: pjsip at lists.pjsip.org > Subject: Re: Payload size change > > Hello, > > I am testing pjsip symbian APS-Direct. I want to change RTP Payload size > when using Passthrough g729 from 20 to 40. Where would i do this change? or > is it possible to do such change? > > cheers, > > Lucas > > ________________________________ > Beyond Hotmail - see what else you can do with Windows Live. Find out more. > > ________________________________ > Upgrade to Internet Explorer 8 Optimised for MSN. Download Now > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > ________________________________ > Beyond Hotmail - see what else you can do with Windows Live. Find out more. > ________________________________ > Upgrade to Internet Explorer 8 Optimised for MSN. Download Now > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > ________________________________ > View your Twitter and Flickr updates from one place ? Learn more! > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > > ________________________________ > View your Twitter and Flickr updates from one place ? Learn more! > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > >
