public static bool RegisterExt(string sExt) { try { IpAddress ip; int iPort = 5060; String sRealm = "10.0.0.8"; String sFromUrl = "<sip:" + sExt + "@" + sRealm + ":" + iPort.ToString() + ">"; // FROM String toUrl = "<sip:" + "1000@" + sRealm + ":" + iPort.ToString() + ">"; // TO if (!SipStack.IsInit()) { SipStack.Init(); } ip = IpAddress.GetLocalHostAddress(); // Having the following line enabled creates the compiler error: SipProvider sipProvider = new SipProvider(ip.ToString(), iPort); /* * Error 11 Error while compiling onReceivedMessage * (Lorg/zoolu/sip/provider/Transport;Lorg/zoolu/sip/message/Message;)V * in * org/zoolu/sip/provider/SipProvider: * Unsupported type org/zoolu/sip/header/ViaHeader * dot42SipTester1 */ return(true); } catch { return(false); } }