Introduction to SIP Based ENUM IP Telephony Infrastructure

1
Introduction to SIP Based ENUM IP Telephony
Infrastructure

• ??? ????????
• Conference over IP Team
• ??? ??
• yzy_at_netrd.iii.org.tw

2
Outline

• Review
• The Next Generation Converged Network
• SIP based IP Telephony System
• Integrate ENUM with SIP Based IP Telephony system
• The first run of SIP project in III NCL

3
Review

• PSTN
• Signaling System Signal No 7
• Carrier T1 and successors ...

Signaling plane
STP
CO
Bearer plane
CPE
Local loop
DTMF
4
Review

• Internet (IP) Phone

AD/DA compress/decompress
AD/DA compress/decompress
5
Review (cont.)

• Telephony Issues
• Signaling
• Addressing
• PSTN - SS7 (ITU E.164)
• VoIP - H.323?SIP?MGCP?Megaco/H.248
• Capability exchange
• PSTN - Analog voice / ?-law?A-law PCM
• VoIP - Digital voice / G.711?G.723.1 ?G.729

6
Review (cont.)

• Telephony Issues
• Bearer
• Transport
• PSTN - TDM T1 trunk
• VoIP - RTP over UDP/IP
• Delay and Jitter
• PSTN - circuit switching / propagation delay
• VoIP - packet switching / unbounded delay and
  jitter
• Internetworking between PSTN IP Telephony

7
Next Generation Converged Network
8
SIP based IP Telephony System
SIP BASIC Call flow
Caller
Callee
Pickup dial
Ringing
Pick up
On-hook
9
SIP based IP Telephony System
SIP Distributed Architecture
SIP Components
PSTN
User Agent
Gateway
10
SIP proxy server
SIP based IP Telephony System
Maybe rewrite SIP request
Proxy server
User Agent
Proxy servers are, for example, used to route
requests, enforce policies, control firewalls.
11
SIP based IP Telephony System
SIP redirect server
Location server
Proxy server or caller
redirect server
Unlike a proxy server, it does not initiate its
own SIP request. Unlike a user agent server, it
does not accept call.
12
Simple SIP call setup and teardown
302 (Moved Temporarily)
ACK
INVITE
Call Setup
302 (Moved Temporarily)
ACK
MediaPath
Call Teardown
13
SIP based IP Telephony System

• SIP based IP Telephony System must support

Operation System Support
Feature and Application Creation
SIP Based Call Control and Switching
14
SIP based IP Telephony System
SIP based
VOCAL System http//www.vovida.org/
15
SIP based IP Telephony System
16
SIP based IP Telephony System
17
SIP based IP Telephony System
SIP proxy Server Acts as a trusted boundary for
calls entering or leaving a network. Provides
authentication and collects billing information
for the CDR server.
18
SIP based IP Telephony System
CDR Server Collects billing information from
Marshal Servers and interfaces with billing
systems using the RADIUS accounting protocol.
19
SIP based IP Telephony System
Provisioning Server Used to provision, configure
and manage subscribers and servers from a GUI.
20
SIP based IP Telephony System
Feature Server Provide CPL based or XML scripts
that run basic telephony features.
21
SIP based IP Telephony System
Basic call initiation
SIP proxy server
SIP proxy server
SIP Phone
SIP Phone
22
Basic call establishment
SIP based IP Telephony System
SIP proxy server
SIP proxy server
SIP Phone
SIP Phone
23
Basic call tear down
SIP based IP Telephony System
Redirect
SIP proxy server
SIP proxy server
RTP
SIP Phone
SIP Phone
24
SIP based IP Telephony System

• Operation System Support (OSS) includes
• Provision
• adding and maintaining network users
• Authentication
• Access list / Digest
• Billing
• Network management

25
Billing (CDR ends to record)
SIP based IP Telephony System
SIP Proxy
SIP Proxy
CDR server
RTP
SIP Phone
SIP Phone
26
SIP based IP Telephony System

• Feature services are the value-added functions of
  the phone system
• Core features
• Calling Information
• Calling Number Delivery (CND) or Calling Line
  Identification (CLID) / Calling Party Identity
  Blocking (CIDB)
• Calling Forwarding
• Forward All Calls (CFA) / Forward - No Answer
  Mode (CFNA) / Forward - Busy Mode ( CFB )
• Call Blocking / Call Screening
• Set features
• Call transfer / Call Return / Call waiting /
  Cancel Call Waiting ( CCW )
• Scriptable features
• Call Processing Language (CPL)

27
Features service - call blocking
SIP based IP Telephony System
Redirect
Call blocking feature server
SIP proxy
SIP Phone
28
ENUM SIP Based Telephony system
SIP phone to PSTN
ENUM DNS
SIP Proxy
Clearinghouses
6. Invite
Gateway
SIP Phone
Gateway SIP proxy
29
ENUM SIP Based Telephony system
PSTN to SIP phone
ENUM DNS
DNS
Softswitch
SIP proxy
STP
SCP
PSTN
SSP
Media Gateway
SIP proxy
30
ENUM SIP Based Telephony system
PSTN to SIP phone
SIP proxy
ENUM DNS
DNS
Softswitch
STP
SCP
SIP proxy
PSTN
SSP
Media Gateway
31
Thanks !