[VoiceOps] New to VoIP

Alex Balashov abalashov at evaristesys.com
Mon Jun 21 16:21:07 EDT 2010

On 06/21/2010 02:49 PM, Jon Radel wrote:

> Well mostly. As an example, Acme Packet SDs have very expensive
> (comparatively speaking, at least) content addressable memory (CAM)
> wherein lives the lookup table for all active SIP sessions, thus
> allowing the hardware to deal with a much higher volume of RTP packets
> than a general purpose computer of the same general size and "power"
> could hope to process, not to mention making it more resilient to DoS
> attacks.

CAM-like memory, and also ASICs to assist in processing of media and 
the CPU work involved in packet forwarding.

There's no question that pound-for-pound, a high-end SBC can handle a 
whole lot more concurrent calls (with media) than general PC hardware 
with a general purpose task-switching OS with a general purpose PCI 
bus, general purpose I/O scheduler, and a userspace process doing a 
lot of the work.

However, a) you may not need that and b) depending on what it is 
exactly that you intend to do, it may be quite possible to design a 
topology that does not involve relaying media at all most of the time 
(which is where proxies tend to be useful), in which case the case for 
the open-source option is substantially bettered.

Alex Balashov - Principal
Evariste Systems LLC
1170 Peachtree Street
12th Floor, Suite 1200
Atlanta, GA 30309
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/

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