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c#parsingsipvoip

Sip parser in c#

I am looking for a library or class in c# that can parse sip packets. I need functions that will help me get the Call-ID field from the packet, types of requests, and basically breakdown the sip packet to its fields.

Does anybody know something that can help me? Thanks, ofek

Solution

  • This class from my sipsorcery project can do it for you.

    Update: If you have a string that contains a full SIP packet you can parse the full thing by using:

    var req = SIPSorcery.SIP.SIPRequest.ParseSIPRequest(reqStr); 
var headers = req.Header;

var resp = SIPSorcery.SIP.SIPResponse.ParseSIPResponse(respStr);  
var headers = resp.Header;

    If you don't know whether the SIP packet is a request or a response you can use the SIPMessage class:

    var mess = SIPSorcery.SIP.SIPMessage.ParseSIPMessage(messStr, null, null);
var headers = SIPSorcery.SIP.SIPHeader.ParseSIPHeaders(mess.SIPHeaders);

    Update 2:

    Given you're using pcap.net to capture the SIP packets you are probably ending up with a block of bytes rather than a string. You can use the SIPMessage class to parse the SIP packet from a UDP payload:

    var mess = SIPSorcery.SIP.SIPMessage.ParseSIPMessage(packet.Ethernet.IPv4datagram.Udp.Payload, null, null);
var headers = SIPSorcery.SIP.SIPHeader.ParseSIPHeaders(mess.SIPHeaders);