Presence and IM using sip 4/22/2017 SIP beyond VoIP Presence and IM using sip

“Presence, the dial tone of the 21-st century” Henry Sinnreich, “The Godfather” of SIP

Adrian Georgescu Founder and CEO of AG Projects Co-chair of ISOC SIP WG in the Netherlands Management board member of OpenSIPS Software Foundation Adrian Georgescu

AG Projects Core Business Delivery and Support of Scalable Turnkey SIP Infrastructures Since 2002 AG Projects Core Business

Projects we are involved with OpenSIPS OpenXCAP MSRP Relay CDRTool MediaProxy SIP SIMPLE client SDK Blink Projects we are involved with

All successful rich communications clients to date implement IM and Presence as a main built-in feature even if VoIP is the money generating service. When all money has been made from proprietary solutions for real-time communications, a global solution based on universally accepted standards will emerge to absorb the demand for Presence and IM Why this IS relevant

The standards for real-time communications are being forged by Internet Engineering Task Force IETF

IETF SIP SIMPLE Working Group SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE) IETF WG produces interoperable standards for SIP, Instant Messaging and Presence IETF SIP SIMPLE Working Group

SIP SIMPLE standards MSRP Protocol and its Relay extension SUBSCRIBE, NOTIFY and PUBLISH SIP methods XCAP Protocol for storage of end-user documents SIP SIMPLE standards

Message Session Relay Protocol (MSRP) is a protocol for transmitting a series of related instant messages in the context of a session. Message sessions are treated like any other media stream when set up via a rendezvous or session creation protocol such as the Session Initiation Protocol (SIP). MSRP Sessions are defined in RFC 4975 and RFC 4976. MSRP Protocol

Is reliable by using TCP transport and secure by using TLS End-to-end delivery confirmation for each message Works sequential, suitable for chat sessions No limit for data size, allows chunking Built-in NAT traversal capability MSRP Properties

Session description for Instant Messaging Content-Type: application/sdp Content-Length: 303 v=0 o=- 3492769359 3492769359 IN IP4 192.168.1.6 s=Blink 0.19.9 (MacOSX) c=IN IP4 192.168.1.6 t=0 0 m=message 2855 TCP/TLS/MSRP * a=path:msrps://192.168.1.6:2855/b2d10bb428210c0ec686;tcp a=accept-types:message/cpim text/* application/im-iscomposing+xml a=accept-wrapped-types:* a=setup:active Session description for Instant Messaging

Session Description for File Transfer Content-Type: application/sdp Content-Length: 408 v=0 o=- 3492769611 3492769611 IN IP4 192.168.1.6 s=Blink 0.19.9 (MacOSX) c=IN IP4 192.168.1.6 t=0 0 m=message 2855 TCP/TLS/MSRP * a=path:msrps://192.168.1.6:2855/b0bd19070755245df628;tcp a=sendonly a=accept-types:* a=accept-wrapped-types:* a=setup:active a=file-selector:name:"About Stacks.pdf" type:com.adobe.pdf size:466028 hash:sha1:83:D4:BB:70:67:FE:D7:04:89:99:2F:14:40:F3:40:46:93:88:0B:33 Session Description for File Transfer

MSRP Methods AUTH – To reserve a session in a MSRP relay SEND – To send messages (or chunks of them) REPORT – For end-to-end delivery confirmation MSRP Methods

MSRP AUTH Method SENDING: 2010-09-07 10:18:03.789769: 192.168.1.6:65310 --> 81.23.228.146:2855 MSRP cecb7a09dd77a505 AUTH To-Path: msrps://ag-projects.com;tcp From-Path: msrps://192.168.1.6:65310/60089caac481a5898a73;tcp Authorization: Digest username="31208005169", nonce="KDiJ6dUltB241YpjU1XEKTEyODM4NDc0ODMuNTg3OjgwLjEwMS45Ni4yMA==", realm="ag-projects.com", qop="auth", cnonce="5546b6f72043768381e0f9c2af95ba2a", nc="00000001", opaque="c1e58368ebe508df8d84b94e71f9b8de", response="79546d58ae501c977c5f4ce74bb4fdfc" -------cecb7a09dd77a505$ RECEIVED: 2010-09-07 10:18:04.007928: 192.168.1.6:65310 <-- 81.23.228.146:2855 MSRP cecb7a09dd77a505 200 OK To-Path: msrps://192.168.1.6:65310/60089caac481a5898a73;tcp From-Path: msrps://ag-projects.com;tcp Authentication-Info: cnonce="5546b6f72043768381e0f9c2af95ba2a", nc=00000001, rspauth="d96211e21bbe0d489c3e3a1c215794f3", qop=auth Use-Path: msrps://node03.dns-hosting.info:2855/KDiJ6dUltB241YpjU1XEKTEyODM4NDc0ODMuNTg3OjgwLjEwMS45Ni4yMA==;tcp Expires: 600 MSRP AUTH Method

MSRP SEND method RECEIVED: 2010-09-07 10:18:05.902297: 192.168.1.6:65310 <-- 81.23.228.146:2855 MSRP OC26za431IPezi3SfKpgNIpt SEND To-Path: msrps://192.168.1.6:65310/60089caac481a5898a73;tcp ://node03.dns-hosting.info:2855/KDiJ6dUltB241YpjU1XEKTEyODM4NDc0ODMuNTg3OjgwLjEwMS45Ni4yMA==;tcp msrps://81.23.228.139:2856/a80a757b57acee5bcd69;tcp Byte-Range: 1-240/240 Message-ID: 837fda182d73143e Content-Type: message/cpim To: Adrian Georgescu 31208005169@ag-projects.com From: test@chatserver.ag-projects.com DateTime: 2010-09-07T08:18:05.413052 Content-Type: text/plain Welcome to the room, Adrian Georgescu. You are the only participant in the room -------OC26za431IPezi3SfKpgNIpt$ SENDING: 2010-09-07 10:18:05.904703: 192.168.1.6:65310 --> 81.23.228.146:2855 MSRP OC26za431IPezi3SfKpgNIpt 200 OK To-Path: msrps://node03.dns-hosting.info:2855/KDiJ6dUltB241YpjU1XEKTEyODM4NDc0ODMuNTg3OjgwLjEwMS45Ni4yMA==;tcp From-Path: msrps://192.168.1.6:65310/60089caac481a5898a73;tcp MSRP SEND method

IM Architecture SIP Client that implements MSRP protocol SIP Server, a standard SIP Proxy MSRP Relay for NAT traversal IM Architecture

IM Architecture A standard SIP Proxy is used in combination with a MSRP Relay. The receiving end-point reserves a TCP port on the publicly reachable relay and offers it in its 200 OK answer to the calling end-point.

XCAP protocol (RFC 4825) allows a client to read, write, and modify application configuration data stored in XML format on a server by using HTTP protocol. An XCAP server is used to store data like buddy lists and presence policy in combination with a SIP Presence server to provide a complete SIP SIMPLE server solution. XCAP Protocol

Presence Rules – stores policy shared with the Presence Agent Resource Lists – stores contact names and SIP addresses RLS Services – stores contacts to which server can subscribe Icon – stores user photo and makes it available for subscribers PIDF Manipulation – stores presence information when off-line XCAP documents

Correlating buddy lists with policy information is tough enough Getting it right is the most complex part building a SIP client OMA has defined how XCAP is used for Presence (yet more convoluted) Implementation complexity an order of magnitude higher than a VoIP call XCAP documents Usage

PUBLISH – SIP Extension for Event state Publication RFC3903 SUBSCRIBE/NOTIFY – SIP Event Notification RFC 3265 Event packages – Presence, Winfo, Xcap-diff SIP Methods

Publish method PUBLISH sip:31208005169@ag-projects.com SIP/2.0 From: "Adrian Georgescu" <sip:31208005169@ag-projects.com>;tag=n0Raw3qnutevy50ST68jskiQlFUH9tjR To: "Adrian Georgescu" <sip:31208005169@ag-projects.com> Call-ID: CXP.qcaQG.LYO1bY0gN-JH1u4hEBuy49 Event: presence Expires: 600 Content-Type: application/pidf+xml User-Agent: Blink 0.20.0 (MacOSX) Content-Length: 745 <?xml version='1.0' encoding='UTF-8'?> <presence xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid" xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model” entity="31208005169@ag-projects.com"> <tuple id="lkqpmdpo"> <status> <basic>closed</basic> </status> <contact priority="0.0">sip:31208005169@ag-projects.com</contact> <timestamp>2010-09-09T11:52:28+02:00</timestamp> </tuple> <dm:person id="exnktxob"> <dm:timestamp>2010-09-09T11:52:07+02:00</dm:timestamp> </dm:person> <dm:device id="erquznkp"> <dm:note xml:lang="en">Powered by Blink 0.20.0 (MacOSX)</dm:note> </dm:device> </presence> Publish method

Subscribe method SUBSCRIBE sip:31208005169@ag-projects.com SIP/2.0 Via: SIP/2.0/UDP 192.168.1.6:60131;rport;branch=z9hG4bKPjzeIfWP8Qwt7cexqnCTioMIif.PM3Zvml From: "Adrian Georgescu" <sip:31208005169@ag-projects.com>;tag=XZCBBfCUGLzVyQxyT4kbb8ToymHlXDFm To: <sip:31208005169@ag-projects.com> Contact: <sip:dncjlzky@192.168.1.6:60131> Call-ID: nfJWHU.kiCqywvL6Qr5oWcFukyTgQ4Cx CSeq: 11717 SUBSCRIBE Event: presence Expires: 600 Accept: application/pidf+xml User-Agent: Blink 0.20.0 (MacOSX) Content-Length: 0 Subscribe method

Notify method NOTIFY sip:nvdaehwt@80.101.96.20:64137 SIP/2.0 Record-Route: <sip:81.23.228.129;lr;ftag=10.11250.1284027705.1140> To: <sip:31208005169@ag-projects.com>;tag=w.dx-9ELRfE366bsqHmI.FpU4TbcTxvV From: <sip:31208005169@ag-projects.com>;tag=10.11250.1284027705.1140 CSeq: 1 NOTIFY Call-ID: Vb5aZkC5K5G3nQUZZJLQQd.19NXrnQgd Content-Length: 1288 User-Agent: OpenSIPS (1.4.5-tls (i386/linux)) Event: presence Contact: <sip:presence@85.17.186.7> Subscription-State: active;expires=600 Content-Type: application/pidf+xml <?xml version="1.0" encoding="UTF-8"?> <entity="31208005169@ag-projects.com"> … </presence> Notify method

Presence Architecture 4/22/2017 SIP Client that implements Presence methods and XCAP SIP Server that implements a Presence Agent XCAP Server for document storage (policy and buddy lists) Presence Architecture

Presence Architecture A Presence Agent together with an XCAP server aggregates the presence information for all SIP devices that belong to a certain SIP address and allows subscriptions to this information based on end-user policy.

Presence Aggregation Multiple devices can publish partial presence document aggregated by the Presence Agent

Watcher Info Event Watcher info event is used for monitoring external parties that subscribed to our own presence. Based on this list we can build a policy that is uploaded into the Presence Agent using XCAP protocol.

RLS Services extension to Presence Event Subscription to RLS services lowers the SIP traffic on the last mile. The SIP client subscribes to only one SIP URI that is expanded by the RLS server into a list. The server sends back consolidated NOTIFY messages.

XCAP Diff Event Multiple clients can automatically synchronize their buddy lists and presence policy by subscribing to this Event. When an XCAP document is changed by one device, the others get notified and can fetch it again.

Subscribe for xcap-diff SUBSCRIBE sip:presence@81.23.228.146 SIP/2.0. From: "saghul" <sip:saghul_test@sip2sip.info>;tag=h6tFH0DxVSRkiHqCUUPpOe2aATsVqX7e. To: "saghul" <sip:saghul_test@sip2sip.info>;tag=10.7209.1285498978.2. Contact: <sip:abejidnv%40192.168.99.53@192.168.99.53:53806>. Call-ID: wnIA-6Qe1hiB3cxUN06JzxQRKjUe3UCT. CSeq: 9073 SUBSCRIBE. Event: xcap-diff. User-Agent: Blink 0.1.4 (Linux). Content-Type: application/resource-lists+xml. Content-Length: 615. <?xml version='1.0' encoding='UTF-8'?> <rl:resource-lists xmlns:rl="urn:ietf:params:xml:ns:resource-lists" xmlns:agp-rl="urn:ag-projects:xml:ns:resource-lists"><rl:list><rl:entry uri="org.openxcap.dialog-rules/users/sip%3Asaghul_test%40sip2sip.info/index"/><rl:entry uri="pidf-manipulation/users/sip%3Asaghul_test%40sip2sip.info/index"/><rl:entry uri="org.openmobilealliance.pres-rules/users/sip%3Asaghul_test%40sip2sip.info/index"/><rl:entry uri="resource-lists/users/sip%3Asaghul_test%40sip2sip.info/index"/><rl:entry uri="rls-services/users/sip%3Asaghul_test%40sip2sip.info/index"/></rl:list></rl:resource-lists> Subscribe for xcap-diff

Available SIP SIMPLE Software OpenSIPS – SIP Presence Agent OpenXCAP – XCAP Policy Server MSRP Relay – NAT Traversal for IM and File Transfer based on MSRP SIP SIMPLE client SDK – Client SDK for all the above Blink – A GUI client built on top of SIP SIMPLE client SDK Available SIP SIMPLE Software

The Presence Agent is the most important architectural component Originally developed in OpenSER, now present in all SER variants Software currently developed and supported by Voice System S.R.L. Home site: http://opensips.org OpenSIPS

Openxcap XCAP server integrated with OpenSIPS Presence Agent Developed and supported by AG Projects http://openxcap.org Openxcap

MSRP Relay NAT Traversal solution integrated with OpenSIPS Developed and supported by AG Projects http://msrprelay.org MSRP Relay

SIP SIMPLE client SDK is a Software Development Kit for development of Real Time Applications based on SIP and related protocols for media transport like Presence, Audio and Instant Messaging (IM). Other media types can be easily added by using an extensible high-level API. Developed and supported by AG Projects http://sipsimpleclient.com SIP SIMPLE client SDK

SIP SIMPLE client SDK - CLI sip-subscribe-presence sip-subscribe-rls sip-subscribe-xcap-diff sip-subscribe-winfo sip-publish-presence xcap-pres-rules xcap-rls-services SIP SIMPLE client SDK - CLI

Blink A state of the art, easy to use SIP client built on top of SIP SIMPLE client SDK. Currently available for Mac, Linux and Windows. Developed and supported by AG Projects http://icanblink.com Blink