[VoiceOps] Any good book on H323?

Alex Balashov abalashov at evaristesys.com
Wed Aug 19 14:03:10 EDT 2009

Mark R Lindsey wrote:
> "IP Telephony" by Hersent, &al., covers H.323 in some depth.  He also 
> covers SIP and MGCP.
>     http://books.google.com/books?id=gC0U-nDGvvsC
> Hersent seems to be an H.323 elitist. I get the feeling he really wants 
> to say, "You SIP users are silly children, with your skulls of IETF 
> mush, as if you can re-invent telephony! I spit on your silly 
> extensibility and lack of respect for the great and wise ITU-T fathers."
> Despite that, it's quite a useful book.

:)  I can understand that perspective, seeing as H.323 was derived 
explicitly with the goal of being used for telephony signaling and 
interoperating with telephony systems.  SIP comes from an IP/packet 
design heritage and no intentions of that sort inhere expressly in its 
conceptual fabric.

Having to graft a bunch of old-world stuff onto SIP has definitely 
created its share of problems and ballooning complexity, although there 
are other reasons too why it has so many applicable standards documents 
(lack of strong de facto reference implementation leadership early on, 

Nevertheless, the H.323 elitism stance is way out of touch with reality.

It's like grumpy Bellheads who insist on building LEC transport cores 
entirely out of TDM, 'cause this newfangled VoIP stuff is immature and, 
besides, everyone knows IP networks can't be trusted.  Have fun with that.

Alex Balashov - Principal
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671

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