On Fri, 8 Jun 2007, Asterisk wrote:

Hi guys,

I was wondering whether there's anyone who could share his/her
experiences with using Microsoft RTC Library. In particular I am
wondering what Ethernet capacity should I have in scenario of 30 people
using Microsoft RTC Library for SIP communication (PBX is obviously
Asterisk :-) ) concurrently (alaw codec being used)? What problems can
be expected in such scenario?

Would a good 1 gBit switch be enough to handle that (Asterisk box would
be connected to that switch with 1 gBit connection, and computers with
Microsoft RTC Library would be connected with a 100 mBit connection)?

I don't know anything about MS RTC.. But if it's just SIP streams of alaw, then a rough guide is that you'll need 80Kbits/sec per stream.

So 30 streams on a Gb network will barely be noticable over the usual background noise ... And each PC running a single stream will be just fine.

The asterisk server will be seeing an aggregate bandwidth of (30*80*2)Kbits/sec, or 4.8Mbits/sec. Hardly anything to wory about. I have Linux routers based on 1Ghz processors that can sustain 20x that traffic, and a 1GHz processor running asterisk would easilly support double that number of connections, so any modern "server" type PC should be fine for your use.

Gordon
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