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SEMS

SEMS. Speaker: Changyu Wu Adviser: Quincy Wu Date:2006/11/13. 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:2006/11/13

  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). SER INVITE INVITE 200 OK 200 OK SMTP mail RTP IP Telephone SMTP server SEMS

  6. SEMS-Modules • Loading default modules • Application modules • provide service logic • Audio modules • provide codecs and file formats

  7. 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

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

  9. Announcement modules RTP IP telephone SEMS

  10. Conference modules RTP IP telephone RTP SEMS IP telephone

  11. Voicemail modules SMTP email RTP IP telephone SMTP server SEMS

  12. Echo modules Hello IP telephone Re: Hello SEMS

  13. 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

  14. The relation between SER+SEMS • SEMS acts as UA and uses SER as SIP stack SER FIFO / sockets IP telephone SEMS

  15. 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

  16. SER-SEMS intercommunication (cont) • ser.cfg request routing example: If (method == “INVITE”) { If (uri=~”sip:2.*@”) { if(!t_write_req(“/tmp/am_fifo”,”announcement”)) { t_reply(“500”,”error contacting sems”); }; break; }; }

  17. 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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