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1999-09-30 EUC'99 2
What is SIP ?
Session Initiation Protocol, RFC 2345Initiating, Changing and Terminating
Multimedia conferences (IP Telephony)
Lightweight
Textbased ”Looks like HTTP”
UDP (TCP)
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Future of SIP?
Easy to implement => many small
companies
Mail servers, HTTP Servers, SIP servers [email protected] sip:[email protected]
Web integration; Services on web pages Click-to-dial
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SIP, Simple Example
INVITE
200 OK
ACK
Audio, video, ...
BYE
200 OK
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SIP Redirect Server Example
INVITE
200 OK
INVITE
200 OK
••
302 Redirect
REGISTER
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SIP, Other Example
REGISTER
REGISTER
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What is a Gateway?
Audio
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SIP/ISDN Gateway
SignallingGateway
MediaGateway
Controller
MediaGateway
ISDN
SIP
RTPPCM
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SIPstack
SIPstack SIP
stack
SIPstack
SIP - ISDN
ISDNstack
ISDNstack
EncodeDecode
Resending
TCPUDP
Messagesupport
SNMP HTTP
State machineState machine
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Erlang code sizesin number of source lines
Encode/decode 1511
SIP stack 2476
State MachineSIP <-> ISDN
2285
ISDN stack 6862
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SwitchBoard
SIP/ISDN Gateway - realisation
IP Network
IPI
100BaseT
RTP4 x E1/T1
ISDN Network
PCI
ISDN DSS1
SIP
10BaseT
IP Network
Distributed Erlang
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Why Erlang/OTP?
1999-09-30 EUC'99 13
Hot code upgrade
External interfaces
Components/Libraries: Mnesia SASL SNMP Inets GS ...
Concurrency lightweight processes
Distribution transparent message
passing
Robustness node fail-over process monitoring
Soft real-time
Some characteristics [http://www.erlang.org/white_paper.html]
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Users
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Mobility Server VoIP Prototype Configuration
NT Server: Mobility Server
Feature
ISDN SIP H.323
DECT
SWB
PLMNPTN
IPI
RE
H.323
IP
H.323SIP
WirelessLAN
FeatureFeature
PSTNTNI
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• Show Inter-operability between IP Terminals and DECT Terminals or PSTN
• Identify effects from implementing existing Mobility Server services over VoIP
• Create qualified arguments on SIP versus H.323 for the Mobility Server product
Mobility Server VoIP Prototype Objectives
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The Future
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Future:Work, work, work...
Standard MG protocol (MGCP,…)
Less prototypish :-)
Administration: SNMP HTTP/CGI
Connect to Ericsson Phone Network
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Redundancy and Capacity
SwitchBoard
IPI PCI
SwitchBoard
IPI PCI
SwitchBoard
IPI PCI
“Eddie”
SIP
“Eddie”
“Eddie”
