Path to Reality for Internet Telephony

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Path to Reality forInternet Telephony

• henry.sinnreich_at_mci.com

Disclaimer These may or may not be the opinions.
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Overview

• Business case for IP telephony protocols
• IETF-ITU Progress PINT/SIP
• QoS and Service Agreements
• Security
• Charging
• Lowest Cost ALL IP Networks
• Is H.323 setting back Internet Telephony?
• Telephony Signaling and Device Control

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IP Tel Protocols Have a Business Case

• Telephony
• Moves to IP
• Most telecom revenue
• Least of traffic
• How much cheaper?

• Internet
• Data is critical
• Most traffic is data
• Telephony is just another IP service

There is no business case for another telephony
network (VoIP) Telephony becomes another Internet
feature Design protocols to support and to
integrate it well
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PSTN-Internet (PINT)
C-gtS INVITE marketing_at_pint.mailorder.com
SIP/2.0 Via SIP/2.0/UDP 169.130.12.5 From
anon-1827631872_at_chinet.com To 1-800-IRON-YES Call
-ID 19971205T235405.56.78_at_chinet.com Subject
Sale of Ironing Boards Content-type
application/sdp Content-length v0 o-
53655765 2353687637 IN IP4
128.3.4.5 IIroning Board Promotion c TN
RFCxxxx 1-201-406-4090 maudio 0 voice
Request to Call Request to Fax Request to Hear
Content
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PINT ITU SG.11 Functional Architecture for
IN/Internet
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QoS Service Level Administration
LDAP
Management Tool
Directory Policies
PDP
PEP
PEP
Edge Router
Edge Router
Access Network
Other Network
Backbone
Backbone Administration
Admin. 1
Admin. 2

• Access net Integrated Services
• Backbone Differentiated Services
• Service Policy Rules in directory
• Policy Architecture
• Directory
• Policy Decision Point (PDP)
• Policy Enforcement Point (PEP)

Policy protocol
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Policy and Accounting for SIP
AAA messages

• Policy events
• INVITE
• ACK
• CANCEL
• BYE

AAA messages
SIP msgs
SIP messages
SIP msgs
SIP Proxy Server AAA Client
SIP client
SIP client
Callee
Caller
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IP Virtual Private Network - Extranet

• Authentication
• Routing
• QoS
• Transactions

• AAA
• Authentication
• Authorization
• Accounting
• Roaming Operations

Credit verification payments
Iptel Gwy
Internet
encrypted tunnels
Security Gwy
Security Gwy
Intranet
Intranet

• Tunneling protocols
• IPSEC
• L2TP, MPLS

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Example Integrated Messaging with RTSP and
SIPE-mail for call centers
Send personal information to customers
1. INVITE
SIP SERVER
MAIL CLIENT
5. e-mail URL
A/V CLIENT
2. LOCATION
3. Setup RECORD PLAY
RTSP
4. VOICE MENU and RECORD a/v MSG Interactive
voice response (IVR)
6. A/V MSG STREAM
MEDIA SERVER
MEDIA PLAYER
RTSP
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Lowest Cost All IP Architecture
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Is H.323 holding back Internet telephony ?

• PCs give IP telephony a bad image - tough PC
  problem
• H.323 was not designed to be an Internet
  telephony standard - but H.3xx extension for IP,
  IPX LANs
• Management Babylon TMN/CMIP/OSI plus SNMP
• Interoperability dead end Shortcuts from ITU
  stds
• Waste of bandwidth 20 byte voice 40 byte
  overhead
• Codecs cant adapt to Internet - though RTCP is
  there
• No fit with Internet security (RAS vs. AAA and
  firewalls)
• Duplication with IN/AIN and Internet servers
• 3rd network routing tables Gatekeeper zones
• WWW unaware - no fit for XML, VoXML - what future
  ?

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Interoperable IP Telephony Gateways

• GWY Protocols ?
• ISO/IEC DSM-CC
• User-Network Protocol
• NOTASIP
• Nothing Other Than A Simple Internet Phone
• SGCP
• Simple Gateway Control Protocol
• RSGP
• Reliable Signaling Gateway Ctrl. Prot.
• DIAMETER series
• Twice RADIUS
• IPDC series
• Six IP Device Control Protocols
• Etheric
• DTR/TIPHON 020004
• SIP with PIP extensions

VOICE, FAX, DATA
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Gateway Signaling Schema
SS7 ANSI
TCAP/SS7
SS7 ETSI
IN
ctrl
SS7 AIN
SIP/IP Signaling
ISUP/SS7
Sig. GWY
ctrl
PSTN
IMT
Media GWY
ISDN
T1 Signaling
RTP
Internet
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IP Telephony DevicesSignaling and Control

• PSTN-IP gateways
• Interactive voice response units
• Automatic call distributors
• Voice recognition understanding
• Conferencing bridges
• Pay phones - web kiosks
• . Other
• IETF How many and what protocols ?