I recently tried to google for "VoIP basics" and a few similar terms. The results were, uhm, unsatisfactory. The pages in the result set all seem to waste too much of the "real estate" with advertisement, the actual content is short and only touches the surface of individual topics.
So perhaps it might help if I write my own Voice over IP Overview. So far, I've covered the digitization of voice, audio codecs, latency and bandwidth optimization, and the Real time protocol. In the next piece, I would like to touch jitter, and then go straight to describing the main VoIP protocols, SIP, and H.323. After that, I would like to discuss for example the topic of VoIP vs. firewalls, and the additional protocols like H.248, IAX2, and SCCP.
What do you think? Will this be useful?
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Hi valdmir!
Its really good info. i was wondering if you could tell me the pros and cons of iLBC codec.
recently i found good blog about pros and cons of speech codec at http://speechcodecs.wordpress.com/
but i couldn't found info about iLBC.
And is this iLBC codec is sellable or licensable? just like what other companies does at www.ipsupermarket.com
Hi,
The floating point implementation of the codec is available royalty free (see http://www.ilbcfreeware.org/). I cannot offer any direct experience with the codec but I would expect the claims about good quality and packet loss robustness to be true, given the slightly higher bitrate (13.33 or 15.2 kbps).
Hi Vladimir,
I'm Jairo Cardona from Colombia South America, and I like to use this tutorial to teach h.323 with my students.
May I used this tutorial?
Thanks.
Jairo A. Cardona
Universidad del Norte
Yes, feel free to use it in your course.
Thank you..its was really useful.
hi first, i don't read this language hehe, i assume this was a post.
Well i readp SIP in you blog and YES this was the best so far.. Thank you and keep doing it. right now i am trying to build an app out of JAIN SIP simple call to my cellphone using Android like voip. but i am having still a lot of difficulty. ANyway more power!
-Mike ,from Philippines
hello Mr Toncar. I read your article about, "About Jitter".
first, thank you for this good and useful article.
I try to translate it to persian language.
in your article there is: "seach 20 milliseconds". I think your mean was "each" not "seach".
good luck
Hi Vladimir! Great blog. Keep posting!
Regards, Nikki from voip-sip.org
Hi Vladimir
Thank you for the excellent tutorial on SIP and VoIP. I was missing some key points to put it all together. You've done an excellent job in explaining it in simple and concise terms. I will post a link in the PBX in a Flash forums to share with others who use the open source Asterisk distribution. Thanks
Hi Vladimir,
I just make your way through your H323Plus tutorial and it's really great! It really helps me a lot to get the basics behind this!
Keep up the great work!
matse
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