RegisterSession session = new RegisterSession(getAlicePhone());
Request request = session.createRegister(null, 1800);
request.addHeader(__headerFactory.createRequireHeader("ext1"));
request.addHeader(__headerFactory.createRequireHeader("ext2"));
Response response =
session.sendRegistrationMessage(request, Response.BAD_EXTENSION);
assertHeaderContains(response, UnsupportedHeader.NAME, "ext1");
assertHeaderContains(response, UnsupportedHeader.NAME, "ext2");
}