asterisk users - Jun 2007 - Asterisk & MS RTC Library & Ethernet Capacity

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)?

Thanx!
Alex

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

Thank you, Gordon!

Yes, MS RTC is just SIP streams of alaw.

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Gordon
Henderson
Sent: Friday, June 08, 2007 10:35 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Asterisk & MS RTC Library & Ethernet
Capacity

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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On 08/06/07, Asterisk <asterisk@abraxas.si> wrote:
> 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)?
Alex:  30 concurrent calls will be about 2.4 megabits in each direction.

10baseT would probably just about handle it.

Steve