1 Kommunikatsiooniteenuste arendus IRT0080 Loeng 7/2010 Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst.

2 Slaidimaterjalid allikatest: The3G IP Multimedia Subsystem(IMS),Third Edition Gonzalo Camarillo and Miguel A.García-Martín ©2008John Wiley and Sons,Ltd. Aila H. Koponen magistritöö (kaitstud kevadel 2008) quence=1

Mobiilvõrk, 3GPP Rel_8 frozen Dec 2008

VoIP

5 Esmavaade konverentsile Public Internet Agency Clients Encrypted Video and Audio

6 Konverents 3 või enam osapoolt Osapoolte arv võib muutuda Meediavood lisanduvad/eemalduvad Konverentsi põhireeglistik (poliitika) Heakskiit konverentsil osalemise tarvis … … Speaker recognition in a conference

Võrguvõimalused

Prioriteedid

Q-o-S

10 Serveripõhine

11 Full Mesh

12 Realisatsioonide areng Voice Gateways Softswitch and Gateways Proxy Server IP Phones RFC GPP Apps RFC 3261 IVR NAT/FW Conf IM Conferencing … sip-01

13 “Rich Media Communications” Send an instant message Start a voice conversation Start a video conversation Send Start a rich media session Show profile/directory entry Make a phone call See availability and select people in any context Select method of communication Decide when to communicate System does the rest Only options that make sense appear Right now As soon as possible First available slot

14 Videokonverentsi standardid (1) ferencing/ t?number=4597 Informational : This document describes multimedia conferencing scenarios. The development of these scenarios is intended to help with the definition and evaluation of the requirements for the centralized conferencing (XCON) working group.

15 Videokonverentsi standardid (2) r= r=4353 Informational : Loosely coupled conferences are easily supported in SIP by using multicast addresses within its session descriptions. In another model, referred to as fully distributed multiparty conferencing, each participant maintains a signaling relationship with the other participants, using SIP. This document presents the overall framework for tightly coupled SIP conferencing, referred to simply as "conferencing" from this point forward.

16 Conference Policy Conference Notification Service Focus Conference Policy Server Conference Participant Conference Functions SIP DialogSIP SubscriptionNon-SIP Konverentsi ülesehitus

17 Konverentsisüsteem (XCON)

18 Konverentsi koosseis

19 Kliendivaade meediaressurssidele

20 Media Multicast Network Multisaade

21 Signaling Media Hajutatud korraldus

22 Signaling Media Conference Server Tsentraalne korraldus

23 Signaling Media Multicast Network Jaotatud funktsioonid

24 Signaling Media - Server-terminalis mudel

25 “Keskpõranda” /floor/ haldus

26 Indicating User Agent Capabilities in SIP (S): [RFC3840] defines a mechanism for carrying capability information about a user agent in REGISTER requests and in dialog-forming requests like INVITE. It has found use with conferencing (the is focus parameter declares that a user agent is a conference server) and with applications like push-to-talk.

27 Basic Network Media Services with SIP (I) [RFC4240] defines a way for SIP application servers to invoke announcement and conferencing services from a media server. This is accomplished through a set of defined URI parameters which tell the media server what to do, such as what file to play and what language to render it in.

28 Referring to Multiple Resources in SIP (S): [RFC5368] allows a UA sending a REFER to ask the recipient of the REFER to generate multiple SIP requests, not just one. This is useful for conferencing, where a client would like to ask a conference server to eject multiple users.

29 A Framework for Consent-Based Communications in the Session Initiation Protocol (SIP) (S): [RFC5360] defines several extensions to SIP, including the Trigger-Consent and Permission- Missing header fields. These header fields, in addition to the other procedures defined in the document, define a way to manage membership on "SIP mailing lists" used for instant messaging or conferencing. In particular, it helps avoid the problem of using such amplification services for the purposes of an attack on the network, by making sure a user authorizes the addition of their address onto such a service.

30 PoC protokollitoetus

31 Lingid (1) tf60/slides/pres-ietf60-sipping-camarillo- consent.ppt ion

32 Lingid (2) = /videoconferencing/