On 19/01/2017 22:56, Daniel-Constantin Mierla wrote: > > Hello, > > > On 19/01/2017 10:48, Hai Bui Duc Ha wrote: >> Hi Daniel, >> >> Thank you for reply. >> >> On Tue, Jan 17, 2017 at 6:05 PM, Daniel-Constantin Mierla >> <mico...@gmail.com <mailto:mico...@gmail.com>> wrote: >> >> Hello, >> >> apparently I missed the follow ups on this discussion, dragged in >> by other topics on mailing list. >> >> Can you get the pcap with all the traffic taken on kamailio >> server for the call (from initial invite to the end of the call)? >> >> I send you the pcap at enclosed file. You can see the packet *No.5 *, >> it missing SIP message body: >> /* Media Attribute (a): rtpmap:8 PCMA/8000*/ >> /* Media Attribute (a): rtpmap:101 telephone-event/8000*/ >> /* Media Attribute (a): fmtp:101 0-16*/ >> >> I expect that content length is mismatching or there is a '\0' >> inside the sdp. >> >> Can you explain me more about this ? > TCP is a stream protocol, meaning that the application (kamailio) need > to read and parse to figure out the end of a SIP message. The state > machine as per RFC requires the application to read and identify the > Content-Length header, take its value, read until the end of headers > is found (an empty line) and from there on read as much as the value > of Content-Length to get the body and consider the end of message there. > > If the sending application puts a lower value in the Content-Length > than the number of chars in the body, the rest remains in the buffer > and the receiving application (kamailio) attempts to parse a new SIP > message. > > The other thing I was thinking of was the presence of '\0' which marks > the end of string in C. > > I will look at the pcap very soon and see what I find there. > The problem is the value of Content-Lenght set by the client -- it is set only to the size that it is view as part of the invite. A bit later the client sends more sdp, but exceeding the size sent in C-L header. That part of SDP remains as garbage.
So there is a bug in client app. Cheers, Daniel -- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com
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