IMS and Media Control. James Rafferty, Cantata Technology August 10, 2007
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1 IMS and Media Control James Rafferty, Cantata Technology August 10, 2007
2 IMS and Media Control
3 IMS and Media Control Relationship to Overall IMS Media Resource Function Prior Art Relationship to Application Servers MRFC MRFD MRF Interfaces Putting the MRF to Work Application Examples
4 The IMS Architecture IP Multimedia Networks CS Network Mm Legacy mobile signalling Networks Mb IMS focus for Media control: MRF Mb IM- MGW CS CS Mc MGCF BGCF Mj Mk BGCF Mg I-CSCF Mk Mw Mi S-CSCF Mm ISC Cx Cx Dx AS Sh C, D, Gc, Gr HSS Mb Mr Mw Dx SLF Mb MRFP Mb Mp Mb MRFC P-CSCF Gm UE IMS Subsystem Ut 3GPP TS V7.2.0 ( )
5 Media Resource Function 3GPP has borrowed the MRF concept from several sources Basic idea of MRF or Media Server is to service the media needs of applications Collect Digits, Process tones, voice play/record, video play/record,
6 MRF Prior Art MRF concepts derived from several predecessors Concept of Decomposed architecture came from Softswitch Movement (ISC, ITU, IETF) Concept of SIP for Media Server control begun by Snowshore and validated by IPCC Reference Architecture Several companies have been working with SIP plus XML based markup languages for Media Control over last few years Several variants including Netann (RFC 4240), VoiceXML, MSCML, MSML/MOML
7 Utility for Media Server Timeline for Media Server Protocols Multifunction Media Server Interface; SIP Paradigm Fixed MGCP Problems; Focus on Gateways; IETF Standard Media Server Afterthought; Not IETF Standard MGCP H.248 SIP/MSCML SIP/netann H All the Features of MGCP, But With SIP Transport Conference-Control Optimized Interface for SIP Environment RFC Editor Queue Added Basic Media Services for Device Control Applications; No known applications Attempt to Address Intellectual Integrity Issues SIP/MSML SIP/MOML- MSML Time
8 MRF Architecture Components ISC App Server Mr (SIP) MRFC Mp (H.248) MRFP S - CSCF Lots of discussion on best way to handle in 3GPP / IETF Some implementers will combine MRFC/MRFP (MRF)
9 MRFC MRFC = Multimedia Resource Function Controller Definition: MRFC can accept SIP Invites requesting tones and announcements, ad-hoc conferences and transcoding Works with MRFP on carrying out media operations if not a combined MRFC/MRFP
10 MRFP MRFP = Multimedia Resource Function Controller Definition: Provides resources to be controlled by the MRFC Mixes incoming media streams (e.g. for multiple parties). Sources media streams (for multimedia announcements). Processes media streams (e.g. media analysis).
11 Related Interfaces Mr (S-CSCF MRFC) interface Based on SIP Active work item in 3GPP; related work in IETF Mp (MRFC - MRFP) interface Based on H.248 (Megaco) Active work item in 3GPP; related work in ITU- T
12 The Controversy Most robust media servers are controlled via SIP 3GPP specified media interfaces only at high level up until now SIP for Mr (to control MRFC) H.248 for Mp (to control MRFP) Many leading MS vendors strongly support a SIP-only MRF However, 3GPP is moving ahead with H.248 as the protocol for the Mp interface
13 Issues with MRFC/MRFP Decomposition With no Media Processing Experience Belief Was MRFC:MGC::MRFP:MG Lots of Media Resources Controlled By Controller Separates Media Control ( Control Plane ) From Media Processing ( Media Plane ) MGC MRFC MRFP MRFP MRFP MRFP
14 What Is Today s Reality? MRFC Capacity 600 Sessions/Box (VoiceXML) 1000 Sessions/Box (Trivial IVR, Basic Conferencing) MRFP Capacity Early Media Servers: 20,000 Sessions/Box Ratio MRFC:MRFP in deployment is at Least 20:1 MRFC MRFC MRFC MRFC MRFC MRFC MRFCMRFCMRFC MRFCMRFCMRFC MRFCMRFCMRFC MRFCMRFCMRFC MRFC MRFC MRFC MRFC MRFC MRFP
15 Another Possible Approach Network Function Required MRFC Capability Discovery MRFC Allocation & Load Balancing Consolidated CDR, OAM, Provisioning Media Resource Function Broker (MRFB) MRFB MRFC MRFC MRFC MRFC MRFC MRFC MRFCMRFCMRFC MRFCMRFCMRFC MRFCMRFCMRFC MRFCMRFCMRFC MRFC MRFC MRFC MRFC MRFC MRFP
16 Potential MRFB Interfaces Clearly, MRFB Uses Mr (SIP) to S-CSCF Do Not Change S-CSCF Should MRFB use H.248 or SIP to MRFC? H.248 Would Change MRFC Creates many Technical Issues Raised Above MRFB Makes Collection of MRFC/MRFP (MRF) Look Like Single Media Resource
17 Putting the MRF to Work Unified Messaging Announcements Video Mail Video Conferencing Sponsored Calling Pre-Paid Voice Mail Conferencing Video Ringback Gaming 3G IMG SIP SIP SIP MSCML SIP VoiceXML 2.5G PSTN Cable IP MSC IMG MGW CMTS SIP S-CSCF / SCIM RTP SIP Routing Cloud SIP SIP w/ VoiceXML SIP w/ MSCML MRF HTTP FTP NFS Web Content Win Media mp3 Text MPEG-4 IP Phones (MRFC/MRFP) Network Storage
18 Example: IMS Network Gaming Demo Developed with IBM and partners Qualphone client on mobile handset Uses presence for user availability MRF provides conferencing ( trash talk ) and IVR Terraplay Lock n Load Multi-player game
19 IMS Gaming Service Delivery Gaming Data Gaming Data Ubiquity SIP AS Qualphone Client Cantata MRF Terraplay Game CDMA Mobile Call WiFi PLMN PLMN MGW-IMG Outbound T1 PRI NexTone CSCF CDMA Mobile Calls BayPacket Prepaid BayPackets Prepaid IBM Presence
20 Example: Sponsored Call Service Developed by ARGELA Technologies Sponsored Call 3G subscriber views a video commercial from a sponsor Subscriber receives a discount on service Rapid development 4 weeks from development to trial Benefits of Sponsored Call Service to Subscribers Sponsors Providers Saves $$ Useful promotions Multimedia channel of advertisements Interactive promotions, campaigns and surveys Select the customer segments New revenue stream from the sponsors Increased air time and revenue
21 Case Study: Video Messaging Deployment Developed by OpenWave Service Features 3G VideoMail Greeting Message drop-off Subscriber retrieval Voic Converged Application Access From PC Over Broadband As Well As Wireless Provider: TMN With more than five million subscribers in Portugal and a total of 25 million accounts worldwide, TMN is Portugal s largest mobile operator. New video service deployed for European Soccer Championship Games in Portugal 2004
22 Other Likely IMS Applications FMC Fixed Mobile Convergence IP Centrex Hosting for Businesses Audio and Video combined with other services For example, conferencing, push-to-communicate, Multimedia over Broadband, Multimedia IM Legacy Migration Voice mail, conferencing, SMS, Prepaid Services
23 Workshop Questions 1. What are some examples of media within an MRF? 2. What are examples of prior art that are influencing the MRF? 3. Which protocols are proposed to control the following IMS elements? MRFC MRFP
24 Summary MRF is the Media Resource Function in the IMS Strongly influenced by prior art in control of Media Servers 3GPP is working on standards for MRF control, with IETF and ITU Still much debate in standards bodies about details Pre-IMS solutions using SIP and XML markup are being deployed today
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