会话线程安全吗？SMPP Logica Library

I want to ask..currently I'm using SMPP Logica Library..for developing SMSC Client...and I'm using session.submit to send message to smsc server,Sending Message almost 50 message/second, and i want to use thread for multiple send ,,because I need every response from server to get Delivery Report...the questions is..is session.submit is thread safe?should i syncronized first the session before sending the message using thread? the code I use to send message is I want to ask..currently I'm using SMPP Logica