Lecture Notes in Computer Science- P113:This year, we received about 170 submissions to ICWL 2008. There were a total of 52 full papers, representing an acceptance rate of about 30%, plus one invited paper accepted for inclusion in this LNCS proceedings. The authors of these accepted papers | An Optimized Scheme for Mobile Learning on IP-Based Network Using SIP 549 To sip alice@ Call-ID Contact sip alice@ 5060 Authorization Digest user- name alice@ realm nonce dd2de673348 f1d19337082e347115bf1 uri sip response a487 130029eae4a850da14342dfaf682 algorithm MD5 SIP 200 OK From sip alice@ tag nVfdNPfdu7qq_tnj t4- U39aC8 To sip alice@ tag 6101 Call-ID Contact sip alice@ 5060 expires 3600 REGISTER sip SIP From sip alice@ tag ImJMioJMu7qq_tnj t4- To sip alice@ Call-ID xgA5 eA5H Contact sip alice@ 5060 Authorization Digest user- name alice@ realm nonce dd2de673348 f1d19337082e347115bf1 uri sip response a487 130029eae4a850da14342dfaf682 algorithm MD5 SIP 200 OK From sip alice@ tag ImJMioJMu7qq_tnj t4- To sip alice@ tag 6792 Call-ID xgA5 eA5H Contact sip alice@ 5060 expires 3600 In the flow of playing courseware and updating session as illustrated in figure 6 Alice chooses to play a courseware which could be retrieved from her courseware list. This triggers the user entity to send a SIP INVITE request message to the m-learning server with a courseware URI such as sip coursewareA@ in its request URI and an IP address of both in contact head field and SDP. After receiving this message the server will prepare for playing this courseware. After it is done the server will respond with a 200 OK message to Alice and Alice will send back an ACK message to acknowledge the receiving of 200 OK. After the 550 S. Fan et al. Al ice Proxy m-learning server INVITE 100 Trying INVITE 100 Trying 200 OK 200 OK ACK ACK RTP stream from e-learning server to Alice 192. 168. 0. 100 UPDATE UPDATE 200 OK 200 OK RTF stream from e-learning server to .
