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SEMS

SEMS. Speaker: Changyu Wu Adviser: Quincy Wu Date:2006/10/30. Overview. Introduction SEMS SER How it works SEMS application modules SEMS audio modules SER-SEMS relation and intercommunication Reference. Introduction.

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SEMS

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  1. SEMS Speaker: Changyu Wu Adviser: Quincy Wu Date:2006/10/30

  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 SER+SEMS • 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 (uri=~”sip:2.*@”) { 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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