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Understanding SEMS and SER for VoIP: A Comprehensive Overview

Learn about SEMS (SIP Express Media Server) and SER (SIP Express Router) for enhancing VoIP with voice services. Explore how they work together, their application modules, audio capabilities, and intercommunication. Discover the reference links for further details.

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Understanding SEMS and SER for VoIP: A Comprehensive Overview

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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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