[reSIProcate-users] Fwd: About the codec ptime of SDP

[resiprocate <resiprocate@xxxxxxxxx>]

---------- Forwarded message ----------
From: resiprocate <resiprocate@xxxxxxxxx>
Date: 2007-8-3 上午12:42
Subject: Re: [reSIProcate-users] About the codec ptime of SDP
To: Justin Matthews <jmatthewsr@xxxxxxxxx>

Thanks for your answer. So it's means I can't set the ptime for every codec? For example, set the G729 ptime is 20ms. and set the PCMA ptime is 30ms ?

 

2007/8/2, Justin Matthews <jmatthewsr@xxxxxxxxx>:

I believe that ptime applies to the entire m-line scope so it is only needed once as it applies to all codecs for that m-line.

 

-justin

 

From: resiprocate-users-bounces@xxxxxxxxxxxxxxxxxxxx [mailto:resiprocate-users-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of resiprocate
Sent: Thursday, August 02, 2007 10:15 AM
To: resiprocate-users@xxxxxxxxxxxxxxxxxxxx
Subject: [reSIProcate-users] About the codec ptime of SDP

 

Hi all. I have created this SDP contents before I make the invite(I want to set the ptime for every codec):

 

v=0
o=- 10974059 10974059 IN IP4 192.168.1.100
s=CALL
c=IN IP4 192.168.1.100
t=0 0
m=audio 21524 RTP/AVP 4 18 3 98 8 0 101
a=fmtp:101 0-15
a=rtpmap:4 G723/8000
a=ptime:20
a=rtpmap:18 G729/8000
a=ptime:20
a=rtpmap:3 GSM/8000
a=ptime:20
a=rtpmap:98 iLBC/8000
a=ptime:20
a=rtpmap:8 PCMA/8000
a=ptime:20
a=rtpmap:0 PCMU/8000
a=ptime:20
a=rtpmap:101 telephone-event/8000

 

//////////////////////////////////////////////////////////////////////////////////////////////////////

Data content(SDP.c_str);

 HeaderFieldValue hfv(SDP.data(), SDP.size()); 

 Mime type("application", "sdp");
 SdpContents sdp(&hfv, type);

///////////////////////////////////////////////////////////////////////////////////////////////////////

 

But I used this SDP to make the invite and check the SIP mesage by ethereal, the invite SDP contents is :

 

v=0
o=- 12370334 12370334 IN IP4 192.168.1.100
s=CALL
c=IN IP4 192.168.1.100
t=0 0
m=audio 20104 RTP/AVP 4 18 3 98 8 0 101
a=fmtp:101 0-15
a=ptime:20
a=ptime:20
a=ptime:20
a=ptime:20
a=ptime:20
a=ptime:20
a=rtpmap:4 G723/8000
a=rtpmap:18 G729/8000
a=rtpmap:3 GSM/8000
a=rtpmap:98 iLBC/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000

 

 

Why reSIProcate modify my SDP ?

 

If I just want to set the ptime for  iLBC and G723, then how can I make the SDP contents?

 

Thanks.