// You can add extension headers of your own making
// to the outgoing SIP request.
// Add the extension header.
Header extensionHeader = headerFactory.createHeader(
"My-Header", "my header value");
request.addHeader(extensionHeader);
String sdpData = "v=0\r\n"
+ "o=4855 13760799956958020 13760799956958020"
+ " IN IP4 129.6.55.78\r\n"
+ "s=mysession session\r\n" + "p=+46 8 52018010\r\n"