Check out these VOIP blogs and VOIP links

• IPtelephony.org - VOIP Telephony and news resources
• VOIP resources - voiceoverinternet.com
• FrameIP - French website: VOIP Telephony and news resources
• Pernau.at - SIP software listing
• Monitor your IP PBX server with PA Server Monitor
• Smith on VOIP - up to date information and news on the latest VoIP products and services
• Nick on IT - insights on the latest developments in IP Telephony
• Asterisk on Windows - 3CX Phone System for Windows
• 3CX VOIP FAQ - VOIP FAQ & Info

IP PBX, SIP & VOIP common questions 

• VOIP FAQ & Info
• What are SIP Phones?
• What is IVR / interactive voice response?
• What is an auto-attendant?
• What is a voice mail system?
• What are IP Phones / IP Telephones?
• Microsoft Response Point vs 3CX Phone System for Windows
• What is Voice over IP?
• What is a PBX Phone System?
• What is a VoIP Telephone?
• 10 reasons to switch to an IP PBX
• What is Unified Communications?
• What is SIP - Session Initiation Protocol?
• What is SDP - Session Description Protocol?
• What is H323?
• What is ECHO cancellation?
• What is RTP - Real Time Transport Protocol?
• What is RTCP - Real Time Transport Protocol?
• What is a SIP-URI?
• What are SIP Methods / Requests and Responses?
• Can you list all known SIP responses?
• Example of SIP Call session between 2 phones
• How does FAX work in VOIP environments?
• What different types of CODECS are there?
• What is T38?
• What is FOIP - Fax over IP?
• What is DID - Direct Inward Dialing?
• What are the benefits of an IP PBX?
• IP PBX: How an IP PBX / VOIP phone system works
• What SIP-based IP PBX's are available?
• Sip phones / VOIP Phones types
• VOIP gateway information - Learn about VOIP gateways
• What do the terms FXS and FXO mean?
• What is a STUN Server?
• What is a SIP server?
• What is a good source of VOIP info?
• VOIP-defined
• VOIP Definitions
• What does ENUM mean?