VoIP and Telephony
· Voice Networks Introduction - Rhys Haden
· VOIP-info.org
· VoIP Codecs Comparison
· VoIP Reference Page - Protocols.com
· GSM, SIP, ISUP and IMS Call Flows
· POTS Analog Interface Technology - Ixia
· FXS vs FXO - QTelNet
· T1, E1, CAS, PRI - Asterisk Guru
· ANI 2 Info - artofhacking.com
· Cisco IOS Voice Command Reference
· IP Telephony - Cisco
· Introduction to Packet Voice Networking - Cisco
· Packet Voice Networking Reference Guide - Cisco
· VoIP Overview - Cisco
· Telephone Number Mapping (enum) - IETF
· ENUM Forum
· VoIP Security Tools - VOIPSA
· IP Telephony Security in Depth - Cisco
· ITPRC - Voice and Data Integration
· Vovida.org - Open Source Software for Datacom and Telecom Environments
· International Packet Communications Consortium
· Telecom Traffic Online
· TelephonyWorld.com the First On-Line Resource for Computer Telephony and Communications
· Telco Exchange - Telco Resources
· NANPA - North American Numbering Plan Administration
· NPA NXX Lookup Page
· US LATA Map
· U.S. NPA LATA Telephone Markets
· Telcodata.US Telcommunications Database - CLLI Codes, Area Code/Exchange and Company Name Searches
· PhoneZone.Com Telecommunications Tutorials and Articles
· Interoffice Mileage Calculator
· PhoneBoy's VoIP Pages
· Asterisk - The Open Source Linux PBX
· Asterisk Guru
· Building Your Own PBX with Asterisk
· General Skype Analysis
· X-Lite - The Best Free Softphone
· Vomit - Voice Over Misconfigured Internet Telephones
· A page on free PC to Phone calls
· ITU-T Terms and Definitions Database
· Glossary of Telecommunications Terms - Atis
· Telecom Glossary - Telecom Books Blog
· IP Telephony Network Glossary - Cisco
· VoIP Glossary - Cisco
· IVR Accessibility Glossary and Telecom Acronyms
· The Telephony Acronyms and Abbreviations List from Hell - Phrack Magazine
SIP
· SIP Forum
· SIP Explained - Cisco
· SIP Resources - Cisco
· SIP Resources
· SIP Response Codes - VoIP-Info.org
· SIP, MGCP and H.323 Papers - RadVision
· SIP Forum
· SIP Server SIP Express Router - iptel.org
· P2P SIP
· SIP Glossary - iptel.org
SS7
· SS7 Tutorial - IEC
· SS7 Fundamentals - ZyTrax
· SS7 Fundamentals - Cisco
· SS7 Introduction - Rhys Haden
· SS7 Tutorial - Performance Technologies
· SS7/IP Interworking Tutorial - Performance Technologies
· SIGTRAN/SS7oIP Fundamentals - ZyTrax
· SS7 and SIGTRAN/SS7oIP Standards - ZyTrax
· SS7parser.com
· SS7 Glossary - SS8 Networks
· SS7 Glossary - Intel
Troubleshooting Tools
· Understanding IP Telephony Protocols - Cisco
· Understanding Packet Voice Protocols - Cisco
· Understanding Delay in Packet Voice Networks - Cisco
· VoIP Troubleshooter
· Indepth: Jitter - VoIP Troubleshooter
· Indepth: Packet Loss Burstiness - VoIP Troubleshooter
· Troubleshooting PSTN
· Voice Quality Scores
· Voice Bandwidth Calculator - Packetizer
· Voice Codec Bandwidth Calculator - Cisco
· DSP Calculator - Cisco
· VoIP Calculators
