1 © 2002, Cisco Systems, Inc. All rights reserved. SIP 标准进展

222 © 2002, Cisco Systems, Inc. All rights reserved. SIP 标准化进展 Enterprise “PBX Features” NAT/FW traversal Security Caller ID Services and Privacy DTMF QoS Configuration/Management Gateways to Other Protocols/TDM

333 © 2002, Cisco Systems, Inc. All rights reserved. Enterprise User-Based “PBX Features” (1) Centrex Style Features Call Waiting / Multiple CallsRFC 3261 HoldRFC 3264 TransferRFC 3515 / Replaces ConferenceRFC 3261 / RFC 3840 Message WaitingRFC 3842 Call ForwardRFC 3261 ParkRFC 3515 / Replaces PickupReplaces Do Not DisturbRFC 3261 Call Coverage RFC 3261

444 © 2002, Cisco Systems, Inc. All rights reserved. Enterprise User-Based “PBX Features” (2) Boss/Admin Features Simultaneous RingingRFC 3261 Basic Shared LinesDialog pkg (stable) / RFC 3680 Barge-InJoin (ready) “Take”Replaces (ready) Shared-Line “Privacy”Dialog pkg Divert to AdminRFC 3261 IntercomURI convention Attendant Services Auto-attendantRFC 3261 / RFC 2833 Attendant ConsoleDialog pkg Night ServiceRFC 3261

555 © 2002, Cisco Systems, Inc. All rights reserved. Perhaps we need Business “Feature Packs” for SIP Phones Feature Pack “A” Basic Call Attended Transfer w/ REFER and Replaces Caller ID and Privacy Message Waiting Basic Dial Plan Basic Conferences Feature Pack “X” Integrated Presence (as NOTIFIER) IM Receiver Feature Pack “B” Join Dialog Package Phone configuration Shared Line support click to dial using REFER TLS Autodial and autoanswer URIs Feature Pack “C” ENUM Remote dialog manipulation with REFER End-to-end encryption Conference Roster

666 © 2002, Cisco Systems, Inc. All rights reserved. NAT/FW Traversal SIP Symmetric Response—RFC 3581 Connection Reuse—SIP WG ID Session Policy—Requirements done Globally Routable URIs—IESG Review Media STUN—RFC 3489 TURN—Individual ID Protocol-specific Relays ICE—to become an MMUSIC WG ID B2BUAs with Media Putting it all together NAT scenarios—SIPPING WG ID

777 © 2002, Cisco Systems, Inc. All rights reserved. Security: Works really well Authentication Digest Authentication—RFC 2617 / RFC 3261 Digest AKA for GSM SIM auth—RFC 3310 Signaling protection TLS (hop-by-hop)—In core spec S/MIME (end-to-end)—In core spec S/MIME AES—Minor update to core spec - RFC ed Authenticated ID Body—AIB draft End-to-Middle, Middle-to-end—Requirements Media protection SRTP—RFC 3711

888 © 2002, Cisco Systems, Inc. All rights reserved. Caller ID Services and Privacy Identity End-to-End—RFC 3261 Transitive Trust Model—RFC 3325 Asserted by Third Party—“Identity” Draft (Solid) Privacy Privacy Header—RFC 3323 New privacy tokens for transitive trust Role-based Authorization

999 © 2002, Cisco Systems, Inc. All rights reserved. DTMF / Digits Time synchronized with media: it works In-band (tones blended in with the speech codec) RFC2833 “AVT Tones” In “signaling”: it sucks Many Proprietary Approaches various payloads in INFO, SUB/NOT All have some bad side effects Double-Digits Poor timing characteristics Using Markup: it will work (Stable) KPML App Interaction Framework

10 © 2002, Cisco Systems, Inc. All rights reserved. QoS Diffserv-style Just set it (diffserv markings) Intserv-style, post-ring Just do it (send RSVP requests post-ring) Intserv-style, pre-ring QoS Preconditions—RFC 3313 Alternate routing on QoS failure? Just works. You get it for free.

11 © 2002, Cisco Systems, Inc. All rights reserved. Configuration and Management Phone configuration event package—Solid config format—Mud SIP MIB—Fairly Solid TRIP and TGREP TRIP is an RFC TGREP is in AD review

12 © 2002, Cisco Systems, Inc. All rights reserved. PSTN Interworking Issues #1 Early Media— No new extensions, BCP in works (Stable) Basic Early Media works fine Early Media + forking does not If it hurts, don’t do that! Overlap Dialing—RFC 3578 It works. Providers can use three variations on the approach when receiving numbers in their network Telephony-Specific Addressing—WG IDs in IPTEL Calling Party Category / Nature of Party Trunk Group and Carrier Codes Number Portability indicator

13 © 2002, Cisco Systems, Inc. All rights reserved. PSTN Interworking Issues #2 Redirection Information: 3 approaches Put the info in the URI: works, requires no extensions, but most folks do not understand the idea. requires coordinated configuration between gateway and proxies cc-diversion: proprietary. functional but with swiss cheese security Request-History: Moist Clay Emergency Services and Prioritized Call completion 911/112 Calls: Works for fixed locations, Working on mobile locations. (PSTN 911 has the same problem) MLPP and IEPS: Request-History—Stable Tunnelling Telephony Signaling—Done RFC 3398 / 3204 / 3372

14 © 2002, Cisco Systems, Inc. All rights reserved. Gateway Services PSTN Gateways ISUP, ISDN, E&M, FXO, FXS gateways have been working for years now. Millions of minutes each day. QSIG Gateways Basic calls and Caller ID works just fine Mapping complex features is work in progress H.323 Gateways Works just as well as PSTN Commercial deployments doing millions of basic calls per month