I would like to educate myself about VOIP where to start?

One Comment

1. Mr. VoIP

   June 26, 2009 at 1:07 pm | Permalink

   - Be famaliar with the most commonly used Codecs, like G.711u/a, PCMU/PCMA, G.729a, GSM, etc.
   - Something about the 3 primary protocols: SIP, H323, IAX.
   - SIP is becomming dominant for stand-alone services and Windows based IP-PBX.
   - IAX is dominant among IP-PBX Asterisk based services.
   - Importance of QOS with VoIP.
   - Importance of Latency, delayed and dropped packets and related issues that affect voice qualiy.
   - Router issues for Port Forwarding and Triggering of SIP ports 5060-5070 and RTP ports 10,000-20,000, etc.
   - NAT traversal issues and usage of STUN Servers.
   - Know how to configure your own user configurable ATA's and Softphones

   I'm self-taught just by doing extensive research over the Internet.
   I've tested using many different VoIP services.

   I downloaded user configurable softphones like the X-Lite, SJPhone, NCH Express Talk softphone, and 3CX VoIP Client from 3CX corp.
   My favorite to use is the 3CX VoIP Client Softphone.

   3CX also has a free down-loadable Windows based IP-PBX for learning about using IP-PBX systems.

   I learned to configure my own Linksys PAP2T-NA and SPA2102-NA VoIP ATA adapters. I recommend the SPA2102-NA because it has built-in router and QOS.

   Learn to configure these devices with BYOD VoIP services like InPhonex, les.net, and CallCentric. Currently, my preferred provider is CallCentric. I use them on my ATA's and Softphones.

   The above should at least give you a starting point…

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