I would like to educate myself about VOIP where to start?
August 13, 2009 by VoIP and Internet Telephony Tips
Filed under More VoIP Answers
Can you answer bad libertine’s question about VoIP?:
I come from a comms background and have a good understanding transmission protocols and a CCNA. Looking at jobs at the moment in the VOIP field. What are the key things to understand/learn with regards to VOIP?
Cheapest VoIP Provider
I come from a comms background and have a good understanding transmission protocols and a CCNA. Looking at jobs at the moment in the VOIP field. What are the key things to understand/learn with regards to VOIP?
Cheapest VoIP Provider
VoIP Feedback: Play a bit with Asterisk. It’s a VoIP pbx (and much more).
VoIP Feedback: - 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…
VoIP Feedback: First of all get an introduction about VOIP. learn about TCP/IP networking from a forum likes.
Then you can start Asteriks PBX system.