[reSIProcate] keepalive question

["frank zhao" <frankzhaohb@xxxxxxxxx>]

hi,all.
 I have some question about the KeepAliveMessage class In resip stack.
1.
 In KeepAliveMessage.cpp , the constuctor method indicate that the
keepalive message should use the "OPTION" method in SIP. but in the
"encode" method in this class. only 2 CRLF is output. Is it correct or
I misunderstand the code?

the code see below:
////constuctor method.
 KeepAliveMessage::KeepAliveMessage(const KeepAliveMessage& message)
  : SipMessage(message)
{
  header(h_RequestLine).method() = OPTIONS;
  Via via;
  header(h_Vias).push_back(via);
}

//// encode method.
std::ostream&
KeepAliveMessage::encode(std::ostream& str) const
{
  str << Symbols::CRLF << Symbols::CRLF; //why only output 2 CRLF here?
  return str;
}


2.
  If I want to use the keep alive message to pass some private
info(such as the client info) between the client and server, .Is there
some method or interface which I can use?

 Can someone can give me some advice?Thanks in advance.

Best Regards