hello every one i m zaheer.i m working on project related to network programming.i m developing a network voice recorder and using WinPcap to captuer the packets.i have to record voice calls comming fron diffrent ips and softphones.now there can be many calls simultaneously.the problem is that

how can i analyse the captured voice packets of diffrent calls and how the packets of a related calls can be saved into a same file.i have to organise packets of voice calls and then convert them to audio in some mp3 or wav format.plese help me in this proble if any one know about it.thanks

Isn't winpcap a windows program? Also please explain what legitimate reason you have to record voip traffic from other computers.

zaheer

WinPcap is packet capture library written in c to capture the udp packets and then placing them to a file.

i have a final year project to record all voice calls happining through soft phones.and we have decided to work on the star topology of network.

now i dont not know how i can anlyse captured packets and their headres because i have to separate RTP(Real time Transport Protocol ) packet of voice from all other udp packets.

WinPcap is a windows packet capture library. There are two problems with this thread. First your project is pretty much a tap of other peoples voip phone calls, which violates one of the LQ rules and outside of a lab environment probably violates the law as well. Also, being a final year project, it is homework.

I'd recommend looking up RTP and RTCP on Wikipedia which give details on the packet formats and provides links to the relevant RFCs. You will need to study the protocols before even thinking of coding. Your paper will need to cite the relative references used in your research as well.