SEMS - PowerPoint PPT Presentation

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SEMS

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provide codecs and file formats. 6. SEMS application modules. Voicemail ... Audio modules provide codecs and file formats. wav: G711u, G711a, .wav file. gsm: ... – PowerPoint PPT presentation

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Title: SEMS


1
SEMS
  • Speaker Changyu Wu
  • Adviser Quincy Wu
  • Date2006/10/30

2
Overview
  • Introduction
  • SEMS
  • SER
  • How it works
  • SEMS application modules
  • SEMS audio modules
  • SER-SEMS relation and intercommunication
  • Reference

3
Introduction
  • SEMS(SIP express media server) is a extensible
    media server which helps you adding voice
    services to your VoIP system?

SER
INVITE
INVITE
200 OK
200 OK
SMTP mail
RTP
IP Telephone
SEMS
SMTP server
4
Introduction-SER
  • SER(SIP Express Router) is an open-source SIP
    proxy, redirect and registrar server.
  • SER s configuration file is divided into four
    main sections.
  • Global parameter
  • External module loading
  • Module parameters
  • Routing blocks

5
How it works
  • Redirecting SIP messages to SEMS
  • A caller gets connected to SEMS. SER has to pass
    every SIP message concerning that call to SEMS
    through unix socket (or FIFO).
  • Loading default modules
  • Application modules
  • provide service logic
  • Audio modules
  • provide codecs and file formats

6
SEMS application modules
  • Voicemail
  • Records voice messages and mail them to the
    callee
  • ISDN Gateway
  • Support calls from and to the PSTN
  • Conference
  • Enables many people to talk together

7
SEMS application modules (cont)
  • Announcement
  • Play audio file (wav file)
  • Echo
  • Test module echoing your voice

8
SEMS audio modules
  • Audio modules provide codecs and file formats
  • wav G711u, G711a, .wav file
  • gsm GSM 06.10 codec
  • iLBC iLBC internet low bitrate codec
  • mp3 .mp3 file writer for mp3 voicemail

9
The relation between SERSEMS
  • SEMS acts as UA and uses SER as SIP stack

SER
FIFO / sockets
SEMS
10
SER-SEMS intercommunication
  • SER provides two functions to pass a request to
    SEMS
  • t_write_req (FIFO)
  • t_write_unix (sockets)

SER
FIFO / sockets
SEMS
11
SER-SEMS intercommunication (cont)
  • ser.cfg request routing example

If (method INVITE) If (urisip2._at_)
if (!lookup("location"))
t_write_unix(/tmp/am_sock, conference)
break
12
Reference
  • SEMS
  • http//www.iptel.org/sems
  • SER
  • http//www.iptel.org/ser
  • SIP.edu
  • http//www.internet2.edu/sip.edu/
  • Regular Expressions
  • http//www.regular-expressions.info/tutorial.html
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