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A SIP-ISDN Gateway

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A SIP-ISDN Gateway Hans Nilsson CSLab Ericsson Utvecklings AB hans_at_erix.ericsson.se What is SIP ? Session Initiation Protocol, RFC 2345 Initiating, Changing and ... – PowerPoint PPT presentation

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Title: A SIP-ISDN Gateway


1
A SIP-ISDN Gateway
  • Hans Nilsson
  • CSLab
  • Ericsson Utvecklings AB
  • hans_at_erix.ericsson.se

2
What is SIP ?
  • Session Initiation Protocol, RFC 2345
  • Initiating, Changing and Terminating Multimedia
    conferences (IP Telephony)
  • Lightweight
  • Textbased Looks like HTTP
  • UDP (TCP)

3
Future of SIP?
  • Easy to implement gt many small companies
  • Mail servers, HTTP Servers, SIP servers
  • hans_at_cslab.ericsson.se
  • siphans_at_cslab.ericsson.se
  • Web integration Services on web pages
  • Click-to-dial

4
SIP, Simple Example
Audio, video, ...
5
SIP Redirect Server Example
6
SIP, Other Example
7
What is a Gateway?
Audio
8
SIP/ISDN Gateway
9
SIP - ISDN
State machine
SIP stack
SIP stack
ISDN stack
10
Erlang code sizes in number of source lines
11
SIP/ISDN Gateway - realisation
SwitchBoard
12
Why Erlang/OTP?
13
Some characteristics
http//www.erlang.org/white_paper.html
  • Concurrency
  • lightweight processes
  • Distribution
  • transparent message passing
  • Robustness
  • node fail-over
  • process monitoring
  • Soft real-time
  • Hot code upgrade
  • External interfaces
  • Components/Libraries
  • Mnesia
  • SASL
  • SNMP
  • Inets
  • GS
  • ...

14
Users
15
Mobility Server VoIP Prototype Configuration
DECT
RE
PLMN
PTN
H.323
SWB
H.323
SIP
PSTN
IPI
TNI
Wireless LAN
IP
NT Server Mobility Server
ISDN
SIP
H.323
16
Mobility Server VoIP Prototype Objectives
  • 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

17
The Future
18
Future Work, work, work...
  • Standard MG protocol (MGCP,)
  • Less prototypish -)
  • Administration
  • SNMP
  • HTTP/CGI
  • Connect to Ericsson Phone Network

19
Redundancy and Capacity
SIP
Eddie
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