VoIP, WLAN and WLANT Links
SIP Gateway (Software packet and Software requirements)
Wireless LAN Telephony (WLANT)
Voice Quality and Voice Transporting
Voice and Data Traffic in Communication Systems (Erlang, CCS)
General Links for VoIP
Internet Telephony (university of Columbia)
Internet Technical Resources (university of Columbia) many Resources about the Internet and its Protocols & Applications
Voice over IP: References (university of Ohio)
Hot Topics in Networking: References (university of Ohio) many Resources about the Networks and its Protocols & Applications
IP-Telephony Issues (iptel.org) information on current technical issues of the Internet telephony
List of ITU-T Recommendation E.164 Assigned Country Codes (Position on 1 June 2000)
ITU-T Recommendation G.xxx Transmission systems and media, digital systems and networks, Voice Codecs …
ITU-T Recommendation H.xxx Audiovisual and multimedia systems, Video Codecs, H.323-Paket …
Portfolio to Get IEEE 802™ to download the Standards 802.xxx
Packetizer a resource for packet-switched conversational protocols
iptel.org the on-line reference for Internet Telephony, GMD 2000/01/02/03, open source software
Vovida.org Your Source for Open Source Communication
VoIP Times VoIP Resources
Protocols Protocols.com offers a comprehensive listing of data communications protocols, their functions in respect to the OSI model, the structure of the protocol and various errors and parameters.
iptelephony collect information about IP telephony software.
VoIP-Info.de Diese Webseite stellt das Buch
"Voice over IP" (VDE Verlag) vor und dient als Portal für Web-Recherchen zum Thema VoIP.
JAVA for VoIP
Java™ 2 Platform, Standard Edition, v1.2.2 API Specification
Java Sound (JS)
Java™ Sound Programmer Guide Java™ Sound API Documentation: javax.sound.sampled - javax.sound.midi
Java Media Framework API (JFM)
Java™ Media Framework API Home Page
Java™ Media Framework API Guide JFM API Documentation
Java Telephony API (JTAPI)
Java Telephony 1.3 Specification
Java COMMON-ISDN-API (JCAPI)
JCAPI Java-CAPI-Interface zur Entwicklung von ISDN-Programmen unter Java. Das Projekt ist bei SourceForge angemeldet: http://sourceforge.net/projects/jcapi. More Details are founded in the following web sites: The architecture of Jcapi and JavaDoc for JCAPI
Java CAPI Project (MMS Computing) Open source software projects: java, capi, isdn answer phone, A-Law u-Law PCM conversion, isdn fax, sff (simple fax format).
Java JAIN API
JAIN ™ SIP API Standard Java™ Interface to SIP, Release 1.0
JAIN ™ SIP API Requirements Specification, Version 1.0
JAIN ™ SIP API Reference Implementation (RI) Specification, Version 0.7
NIST-SIP IP telephony project: Java JAIN-SIP, open source software
JAIN SIP Tutorial (NIST)
Java SIP Library (university of Columbia) Java Software packet. This Website describes the features and architecture of the library and the features of the SIP protocol implemented. A section on how to use the library and how to develop a simple application is also provided.
Complete Implementation of the JAIN SIP API. The library is currently not available for download.
Java JAIN SIP Lite
Java SIP Servlet
Draft of SIP Servlet (2000)
Programming SIP Services in Java (Softarmor.com - Java SIP Servlet)
Programming SIP Services in Java (Fokus.gmd.de - Java SIP Servlet)
Java Socket Programming
RWD [htm] Essentials of the JavaProgramming Language: A Hands-On Guide, Part 1 (sun.com - --.--.--) programming in the Java language.
RWD [htm] Essentials of the Java Programming Language: A Hands-On Guide, Part 2 (sun.com - --.--.--) network communications (Sockets Programming), building a user interface using more components, data encryption and decryption (pseudo code only), grouping multiple data elements into one object (collections), and internationalizing a program.
RWD [htm] TCP/IP, UDP & Multicasting Through Java's Socket (cswl.com - --.--.--) Explaining the TCP& UDP Socket Server/Client with examples, also the Multicastinging.
RWD [htm] Socket Programming in Java (pont.net - --.--.--) Examples for TCP-Socket Server/Client & HTTP-Server, also examples for C.
H.323 Protocol
H.323 Forum everything about H.323 Protocol
H.323 Corner Cisco - Deploying
H.323 Applications in Cisco Networks
H.323 Client Software information on H.323 client programs and comparison between it
H.323 Open Source Software
OpenH323 The OpenH323 project aims to create a full featured, interoperable, open source software
Linux H.323 - ISDN Gateway (telos.de) open source software
Virtual Net Linux H323-ISDN Gateway - isdngw
ASTERISK Asterisk is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Asterisk provides Voicemail services with Directory, Call Conferencing, Interactive Voice Response, Call Queuing. It has support for three-way calling, caller ID services, ADSI, SIP and H.323. asterisk-oh323 package adds H.323 support to the ASTERISK soft PBX. This is achieved by interfacing the
OpenH323 library to ASTERISK through an appropriate channel driver
SIP Protocol
SIP (university of Columbia)
SIP Implementations (university of Columbia) some implementations in progress or completed SIP Center portal for the commercial development of the SIP
SIP and Internet Telephony (university of Columbia) Papers, Books and Talks
iptel.org the on-line reference for Internet Telephony, GMD 2000/01/02/03, open source software
NIST-SIP IP telephony project: Java JAIN-SIP, open source software
VIPs of SIP: Henning Schulzrinne , Jonathan Rosenberg vCert white papers on requirements for SIP-Hardphones, May 2003
SIP Link-Sammlung (different links for programming SIP)
SIP Clients (Free Software)
X-Lite A FREE premium SIP softphone with many PBX-like features. X-Pro is for Windows CE, but not free.
SIP Gateway (Software packet and Software requirements)
About ISDN many ISDN-Links
CAPI COMMON-ISDN-API (CAPI) is an application programming interface standard used to access ISDN equipment connected to basic rate interfaces (BRI) and primary rate interfaces (PRI).
CAPI Documentation (Overview) (PDF files)
Java CAPI Project (MMS Computing) Open source software projects: java, capi, isdn answer phone, A-Law u-Law PCM conversion, isdn fax, sff (simple fax format).
JCAPI Java-CAPI-Interface zur Entwicklung von ISDN-Programmen unter Java. Das Projekt ist bei SourceForge angemeldet: http://sourceforge.net/projects/jcapi. More Details are founded in the following web sites: The architecture of Jcapi and JavaDoc for JCAPI
ISDN/Telephony Gateway (Project) SIP is not supported
SIP to ISUP (ISDN User Part)
RWD [htm] RFC 3398 - Integrated Services Digital Network (ISDN) User Part (IETF - --.12.02)
RWD [htm] RFC 3578 - Mapping of Integrated Services Digital Network (ISDN) (IETF - --.08.03)
RWD [htm] draft-ietf-sipping-pstn-call-flows-00.txt (IETF - --.08.02) expires 02.2003
RWD [pdf] SIP for Telephones, SIP-T (RFC 3372) Presentation
VOVIDA.org Gateway
SIP based Single-line VoIP Residential Gateway (SIPRG) development of a PC based VoIP Gateway.
SIP Residential Gateway (SIPRG) an open source application based on the Session Initiation Protocol (SIP). The SIPRG is an IP Telephony Gateway that allows a SIP User Agent to make and receive calls between the Public Switched Telephone Network (PSTN) and a SIP-based network such as VOCAL. The SIPRG was developed with the VOVIDA SIP stack version 1.3.0, and uses a QuickNet LineJACK card (www.quicknet.com) for connecting an Analog telephone line. Currently, it supports only a single LineJACK card and is therefore a single-line gateway.
NIST-SIP Gateway
JAIN-SIP Gateway The NIST-SIP gateway allows starting a SIP server between 2 networks and forward messages forth and back between them. Therefore, this gateway starts 2 SIP stacks each of them listening to a different network interface. The gateway is using the RTP gateway API provided in the jain-sip-3pcc package for bridging the RTP streams. All RTP packets received from one side of the network will be forwarded to the other side. Moreover, the NIST-SIP gateway has the capability to forward SIP messages to a PSTN gateway. The NIST-SIP gateway also functions as a SIP registrar.
RTP Protocol
Papers on RTP (university of Columbia)
Java™ Media Framework API Guide (java.Sun) RTP for Java
ITU Recommendations for H.323
ITU-T Recommendation H.xxx Audiovisual and multimedia systems, Video Codecs, H.323-Paket …
IETF RFC
RTP
RFC 1889 RTP: A Transport Protocol for Real Time Applications
RFC 1890 RTP Profile for Audio and Video Conferences with Minimal Control
RFC 2198 RTP Payload for Redundant Audio Data
RFC 2326 Real Time Streaming Protocol (RTSP)
RFC 2658 RTP Payload Format for PureVoice™ Audio
RFC 2833 RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
RFC 3550 RTP: A Transport Protocol for Real-Time Applications
SIP
RFC 2327: SDP: Session Description Protocol
RFC 2543 SIP: Session Initiation Protocol
RFC 2976 The SIP INFO Method
RFC 3050 Common Gateway Interface for SIP
RFC 3261 SIP: Session Initiation Protocol
RFC 3262 Reliability of Provisional Responses in SIP
RFC 3263 SIP: Locating SIP Servers
RFC 3265 SIP-Specific Event Notification
RFC 3326 The Reason Header Field for the Session Initiation Protocol (SIP)
RFC 3361 DHCP Option for SIP Servers
RFC 3428 Session Initiation Protocol Extension for Instant Messaging
IETF-SIP RFCs & Internet-Drafts
IETF-MMUSIC Multiparty Multimedia Session Control (mmusic): MMUSIC-Working Group was chartered to develop protocols to support Internet teleconferencing and multimedia communications. RFCs & Internet-Drafts
Internet Telephony
RFC 2303 Minimal PSTN address format in Internet Mail
RFC 2458 Toward the PSTN/Internet Inter-Networking—Pre-PINT Implementation
RFC 2705 Media Gateway Control Protocol (MGCP) Version 1.0
RFC 2719 Framework Architecture for Signaling Transport
RFC 2804 IETF Policy on Wiretapping
RFC 2805 Media Gateway Control Protocol Architecture and Requirments
RFC 2806 URLs for Telephone Calls
RFC 2824 Call Processing Language Frame work and Requirements
RFC 2846 GSTN Address Element Extensios in E-mail Service
RFC 2848 The PSTN Service Protocol: Extension to SIP and SDP for IP Access to Telephone Call Service
RFC 2871 A Framework for Telefony Routing over IP
RFC 2916 E.164 number and DNS
Instant Messaging und Presence Protocol
RFC 2778 A Model for Presence and Instant Messaging
RFC 2779 Instant Messaging / Presence Protocol Requirements
RFC 3428 Session Initiation Protocol Extension for Instant Messaging
H.323 vs. SIP
H.323 versus SIP: A Comparison
SIP versus H.323 (iptel.org)
Wireless LAN (WLAN)
IEEE 802.11 Wireless to download the Standards 802.11, 802.11b, 802.11a and 802.11d
IEEE 802.11 Working Group Wi-Fi Alliance
802.11 Planet Wireless Local Area Network an Hochschulen (University of Rostock)
Wireless Networking and Mobile IP References
Defining and Improving Data Throughput in Wireless LAN, White Paper (Texas Instrument)
Hybrid Coax-Wireless Multimedia Home Networks Using 802.11 Technology, White paper (Texas Instrument)
The Future of Wireless LANs will be Multimode, White paper (Texas Instrument)
Wireless LAN Telephony (WLANT)
[pdf]Wireless LAN Telephony (WLANT) (University of Rostock), 2003
[pdf]VoIP over WLAN White papers (Texas Instrument), 2003
[pdf]Voice Services over 802.11 WLAN or Routing voice traffic over wireless LANs, 1999
[ppt]Voice Transmission in an IEEE 802.11 WLAN Based Access Network
[pdf]Supporting VBR VoIP Traffic in IEEE 802.11 WLAN in PCF Mode
WLAN-Handys
Spectrum24® NetVision Phone WLAN-Handy, H.323 & Skinny supported
Spectralink® NetLink Phone NetLink e340 und e640 Cisco
Voice over WLAN (VoWLAN)
[htm] Symbol patents voice over WLAN (InfoSync World - 02.05.2002)
Symbol Technologies has been awarded a patent for telephonic communications for wireless digital devices using wireless local area networks (LANs). Commonly referred to as wireless Voice-over-Internet Protocol (VoIP), Symbol says it was the first company to pioneer the methodology that made it commercially viable for devices to handle telephony voice communications over 802.11 wireless LANs.
[htm] Voice Over WLAN Patent Awarded (ISP Planet - 14.05.2002) Symbol Technologies is one of the first to deploy commercially viable devices that handle voice telephony communications over 802.11 WLANs.
[htm] Voice over WLAN: Will the Market Finally Answer? (Electronics.ca - --.03.03) Research Report, With less than 30 thousand Voice over 802.11b handsets shipping out in 2002, the Voice over Wireless LAN (VoWLAN) market is still an extremely small, immature market, albeit one with a significantly growing amount of interest and potential.
[pdf] Adaptive Interactive Speech Transmission over 802.11 Wireless LANs (Dipartimento di Automatica e Informatica /IEIIT-CNR Politecnico di Torino Italy - --.--.--) an adaptive technique to transmit speech over 802.11 wireless packet networks. According to the pro-posed scheme, the speech coding rate of a network-driven variable bitrate coder is selected to match the istantaneous wireless channel conditions: higher rates (i.e., larger pack-ets) for low error rates, lower rates (i.e., smaller packets) when the channel is noisy.
[pdf] SpectraLink Voice Priority (SpectraLink, White Paper - --.--.--) Quality of service for voice traffic on wireless LANs
[pdf] Wi-Fi Telephony (SpectraLink, White Paper - --.--.--) Wireless Voice over IP Presents New Opportunities, Challenges
[htm] Voice Over Wireless LAN (Internet Telephony - --.11.03) Third generation (3G) wireless wide-area network (WWAN) technology promises to bring high-speed packet services to mobile subscribers and pave the way for true converged voice and data wireless services.
[htm] Will Voice over WLAN Ride Wi-Fi Growth? (Teledotcom - 17.03.03)
[htm] The Case for Voice over WLAN (WI-FiPlanet – 11.03.02)
[htm] Architecting Wireless LANs for Long-Term ROI and Added Security (Radioframe Networks - --.--.--) Architecting Wireless LANs for Long-Term ROI and Added Security.
[pdf] TIA . VoWLAN Project TR-41.3 (TIA - 08.05.03) working group
[pdf] Voice over Public Access WLANs Worldwide 2002- 2006 (Teleanalytics - --.10.02)
Voice Quality and Voice Transporting
ITU-T Recommendation G.xxx Transmission systems and media, digital systems and networks, Voice Codecs …
QoS of VoIP over WLAN Useful Links
Technical Report: QoS of VoIP over WLAN
Testbed-based Performance Evaluation of VoIP over WLAN
Understanding Delay in Packet Voice Networks Cisco white paper
Test tools (free Software)
Etheral (Protocol Analyser) Etheral for VoIP Protocols: H.323, SIP, SDP and RTP
SIPSAK (SIP Swiss Army Knife) sipsak is a command line tool which can send simple requests to a SIP server. It can run additional tests on a SIP server which are useful for admins and developers of SIP enviroments." Supports SIP "traceroute".
SIP Scenario A Perl-based tool that generates HTML SIP call flows from Ethereal traces (A Windows executable included in the package).
VoIP-Bandwidth Calculator
Online
Bandwidth Calculator (packetizer.com)
Erlangs and VoIP Bandwidth Calculator
Lines to VoIP Bandwidth Calculator
Erlangs and VoIP Bandwidth Calculator Online Calculator
Standalone
WLANT Calculator (University of Rostock) VoIP-Bandwidth Calculator for LAN and WLAN, IPv6 included
Voice and Data Traffic in Communication Systems (Erlang, CCS)
An Introduction to Erlang B and Erlang C with mathematical Formulas
Voice and Data Traffic Engineering in Wireless Communications Systems Erlang, Erlang B and others
Resource Dimensioning Using Erlang-B and Erlang-C Erlangs and VoIP Bandwidth Calculator Erlangs for VoIP
Erlang Calculator for Erlang B and C, formula of Erlang.B
Erlang Programming
Erlang B and C Routines in MATLAB final function of Erlang B and C for Matlab.
Program to solve for Erlang-B and Erlang-C probabilities C-Program only for the Probability of Erlang B and C
Conferences
VON (Voice over Net) GMD
Books
Magazines
IP Pulse (Voice and Fax over IP News)
Telephony Online (Internet Telephony)
Organisations
IEC (International Engineering Consortium)
IEEE The IEEE (Eye-triple-E) is a non-profit, technical professional association of more than 380,000 individual members in 150 countries. The full name is the Institute of Electrical and Electronics Engineers, Inc., although the organization is most popularly known and referred to by the letters I-E-E-E.
VON (Voice on the Net) The VON Coalition's mission is twofold: actively advocate the viewpoint that the IP Telephony industry should remain as free of governmental regulations as possible, and to educate its members on regulatory and policy issues of business importance
W3C The World Wide Web Consortium (W3C) develops interoperable technologies (specifications, guidelines, software, and tools) to lead the Web to its full potential. W3C is a forum for information, commerce, communication, and collective understanding. On this page, you'll find W3C news, links to W3C technologies and ways to get involved.
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