Hi, i am using WinPcap with MSVC for monitoring VoIP calls using H.323 over a LAN. I've studied about the protocol and found that it uses h.225 messages for call signaling purposes. I am able to get the h.225 session descriptions with winpcap but not in plaintext. the packets were encrypted and i found out that session descriptions in h.323 are ASN.1 encoded using PER method. since i am not familiar with ASN.1 and PER encodings and also there is no available examples on internet about this, i'm very much confused on how to extract the actual messages from this encoded raw binary format. The web had some examples on DER and BER encodings, but PER is mentioned rarely and in some places it is described in a way which can only be digested by an expert. Since i am a novice, i need a sample code in C or C++ for converting these PER encoded bytes into readable ASN.1 format. I can then compile the ASN.1 messages back to C data structures.<div>
<br></div><div>Thanks & Regards.<br clear="all"><br>-- <br>Fun...Everyday...Everytime<br>
</div>