mobile end-to-end communication services with the … end-to-end communication services with the...

Mobile End-to-End Communication Services with the Java™ Platform, Micro Edition and Java Platform, Enterprise Edition

Kristoffer Gronowski, Senior Specialist, EricssonOla Dahlqvist, System Architect, EricssonTS-5802

Speaker’s logo here (optional)

2008 JavaOneSM Conference | java.sun.com/javaone | 2

To show how end to end communication between Java ME platform and Java EE platform can be done with the SIP protocol.The samples will demonstrate how it can be done and full code reference URL can be found in the resources slide.


Agenda

IntroductionLow level SIP communication APIsDevelopment tools and demoHigh level communication APIsReal product scenarioFindings and resources


BioKristoffer

Server side guyFirst JavaOne℠ conference appearance (1st attendance 1998)11 years developer in Java platform, 8 with SIPExpert group member JSR-289 (SipServlet)Architect and one of the initial 3 developers to write the Sailfin code base.

OlaClient side guyCo-designer of JSR-180 (SIP) in EMP and SonyEricsson phones Member of the RI team for JSR-281Architect for Ericsson Multimedia products building on Java ME & Java EE platforms


What is SIP?Evolution from HTTP to enable asynchronous communication style.Standardizes session establishment, transfer and renegotiation frameworks.Base for presence (mood indication) application framework.Messaging, chat and file transfer applications.Used for setup of voice and video over IP.Scalable in architecture. Entities are both client and servers.UDP/TCP/TLS based.


SIP Location lookup registrar case

REGISTER

200 OKMESSAGE

MESSAGE

200 OK

200 OK


Java Platform SIP Support Java ME Platform• JSR-180 (SIP API)• JSR-281 (IMS API) (Final Approval Ballot)

• Other useful JSR's on the client side• JSR-135 (Mobile Media API)

Java EE Platform• JSR-116 (Sip Servlet 1.0 API)• JSR-289 (Sip Servlet 1.1) (Work in progress)

• Other useful JSR's on the server• JSR-141 (Session Description API)• JSR-309 (Media Server Control API) (Work in progress)


User AliceApplication

Server(SIP)

Network Address TranslatorThe Problem

User Bob

Home network10.0.0.1

Home RouterNAT

The Internet147.214.199.1

[email protected]

[email protected]

I'm at 10.0.0.12

No Route10.0.0.12


Agenda



Client – Java ME PlatformJSR-180 (SIP API)• Low level API SIP

• Requests modeled as connections• Application can read and write headers and body

• Available in SonyEricsson phones (Java Platform 8 and higher), for example W910i, K850i and Z750i, and Nokia N95

• Part of JSR-248 (Mobile Service Architecture)• Two modes

• Dedicated mode - each Java ME application has it's own SIP stack

• Shared mode - the SIP stack is shared with other Java ME and/or native applications


Server – Java EE PlatformJSR-289 SipServlet 1.1 Sailfin open source (JSR in PFD)Supports multiple SIP applications and composition.Can act as client, server, proxy or a mix.In container connection to Java EE platform and further integration point WS, REST, EJB, ConnectorsOther communities (jVoiceBridge,e-charts,mobicents) Tools support Netbeans™ integrated development environment & Eclipse


Agenda



Development Tools and Simple Message reflector demo


JSR-180 Sending request

SipConnectionNotifier scn;//Dedicated Mode initscn = Connector.open("sip:5060;transport=tcp");SipClientConnection sc; //Open connectionsc = Connector.open("sip:[email protected];transport=tcp");sc.initRequest("MESSAGE", scn);f = "sip:X@"+scn.getLocalAddress()+':'+scn.getLocalPort();sc.setHeader("From", f); //Sets the from headersc.send(); //Sends the message outboolean ok = sc.receive(32000); //Wait 32 sec

mailto:[email protected]


JSR-180 Receiving requests

//Blocks and waits for messageSipServerConnection conn = scn.acceptAndOpen();//Read the bodyInputStream is = conn.openContentInputStream();while ((ch = is.read()) != -1) {

msg[index++] = (byte) ch;}is.close(); //Operate on the received messageconn.initResponse(200);conn.send(); //Sends the response out//Close the connectionconn.close(); //Does not close the TCP socket!


JSR-289 Sip Servlet message handling

//Injecting Sip Factory@Resourceprivate SipFactory sf; //Sip servlet service methodprotected void doMessage(SipServletRequest req) {

//Read the bodyString msg = req.getContent().toString();log("Received message = "+msg);SipServletResponse resp = req.createResponse(200);resp.send();

.

.

.


JSR-289 Sip Servlet message sending

//Send message in other directionSipURI user = req.getFrom().getURI();String remote = "sip:"+user.getUser()+ '@'+req.getRemoteAddr()+':'+req.getRemotePort();SipServletRequest echo = sf.createRequest( req.getAppSession(),"MESSAGE",req.getTo(),remote);echo.setContent(msg,req.getContentType()); echo.send(); //Send the message


Agenda



IP Multimedia Subsystem (IMS)Purpose• Move voice and multimedia communication to packet-based

technologies, to merge telephony (fixed and mobile) and InternetArchitecture • Control signaling based on SIP• A standardized network infrastructure that serves as a foundation

for higher-level services• IMS solves NAT and QoS

Users • Peer-to-peer multimedia communications


JSR-281 (IMS API)High-level Java ME API for multimedia session establishmentProvides media capabilities • Real-time Transport Protocol (RTP), voice & video (RFC-3550)• Message Session Relay Protocol (MSRP), chat & file transfer

(RFC-4975)Defines support from platform• Provides an identity• Multi application framework

Successor - JSR-325 “IMS Communication Enablers” • OMA Presence, OMA Instant Messaging, MMTel, Push to Talk etc.


Example 2Simple JSR-281 & JSR-289 application interactionRecord a video clipSetup a session using the SIP INVITE methodNegotiate and file transfer with MSRPUpload the video clip from Sailfin to YouTube


JSR-281 Demo


JSR-281 Start session//Create service object service = (CoreService)

Connector.open("imscore://com.ericsson.CallApp");service.setListener(this);//Create sessionsession = service.createSession("sip:[email protected]",

"sip:[email protected]");session.setListener(this);//Create mediamedia = (FramedMedia) session.createMedia("FramedMedia",

Media.DIRECTION_SEND);//Start session - initiate SIP session establishmentsession.start();//Once the session is established – send the file messageId = media.sendFile("file:///e:/videos/test.mp4",

"video/mp4", headers);


Agenda



Multimedia Communication Suite (MCS)Features• Presence, Chat, File transfer, Service

capabilitiesClient• Uses IMS support in SonyEricsson

phones and JSR-211 (Content Handler API) to integrate into phone book.

Network Solution• Several core components built on top of

same code that was the initial donation to Sailfin.


Rich Communication Suite (RCS)


Agenda



NAT TraversalConcepts to overcome the problem

Dedicated NetworkProtocol awareComponents

GenericSolution

<client side>

ICE

STUN

TURN

RSIP

IMSMidcom

Internet only

TunnelingVPN

ALG

Focus area Rport


NAT/FW findingsTopology depends on your operator. (ALG)Ice draft (conn reuse & ping) (draft-ietf-mmusic-ice)STUN probe what is there using UDP (RFC-3489)Rport extension. Don't trust the client. (RFC-3581)Short UDP states (A:ping packets)No inbound TCP connections (draft-ietf-sip-outbound)Media also problematicDo not put the server behind NATIMS = SIP will work


HintsTCP saves batteriesSign the MIDletCheck if ME JSR is operator lockedUse network analyzers like Wireshark for SIP and mediaStart without NAT if possible (Access Point APN/PDP)• Try the Wireless Toolkit (WTK) behind NAT (beware phone&WTK

can behave differently)


For More Information

TS• TS-5866 Project SailFin

Pavilion• JSR-281 Demo at Ericsson Booth #618• MCS Demo at Ericsson Booth #618

Links• https://sailfin.dev.java.net Example code and blog on Sailfin• http://www.ericsson.com/mobilityworld SDS IMS Eclipse tool• http://www.tech-invite.com/ All you need to know about SIP

Contact info• [email protected]• [email protected]

https://sailfin.dev.java.net/

http://www.ericsson.com/mobilityworld

http://www.tech-invite.com/




Java ME Platform - Summary

SIP RTPMSRPOS

JSR-180

IMS Communication Services

Abs

tract

ion

CLDC/MIDP

JSR-180 JSR-281

JSR-325IMS Communication Enablers

Communication Application

??

?

?


Summary

There are many new JSR-180 capable devices 2008On the server side production grade open source serversMiddleboxes NAT/FW makes a real problem, however:Higher level API's and IMS can make it more controllableThis technology is out there and it is built to scale

Reuse the 10+ years experience of SIP as communication protocol researched by the IETF & IMS communities


Kristoffer GronowskiOla DahlqvistTS-5802

Speaker’s logo here (optional)

mobile end-to-end communication services with the … end-to-end communication services with the...

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