Will ESME and SMSC automatically disconnect？

[xbsbsvjshs]

If you do not use unbind, will ESME and SMSC automatically disconnect if they are idle for a long time。
Thank you very much!

[xbsbsvjshs]

TCPIPConnection connection = new TCPIPConnection(ipAddress, port);
connection.setReceiveTimeout(20 * 1000);
session = new Session(connection);
session.bind(request);

If no message is received within 20 seconds, will the connection and binding be broken？
Thank you !

[xbsbsvjshs]

If no data is received, will the socket automatically disconnect？
Thank you very much!