//
//
// Retrieve the SessionState associated with a dialog.
//
//
internal SessionState GetSessionState(Microsoft.Rtc.Sip.Message Msg)
{
string CallId = GetHeaderValue(Msg, "Call-Id");
if (SessionStateTable.ContainsKey(CallId))
{
//
// Return saved session state
//
return((SessionState)SessionStateTable[CallId]);
}
else
{
//
// No state exists -- default state is Unknown
//
return(SessionState.Unknown);
}
}
//
//
// Retrieve the value of the first instance of a message header.
//
//
internal string GetHeaderValue(Microsoft.Rtc.Sip.Message Msg, string Hdr)
{
IEnumerator walker = Msg.GetHeaders(Hdr);
walker.MoveNext();
if (walker.Current != null)
{
//
// Return first header
//
return(((Header)walker.Current).Value);
}
else
{
//
// No headers found
//
throw new InvalidOperationException("Message doesn't contain a " + Hdr + " header");
}
}