[Asterisk-Users] Do we need a QOS switch ?

2006-02-05 Thread phil . dawson
Hi,

We have 10 people on our network and each person will have a SIP phone
connected to our Asterisk server.  All phones, Asterisk, other servers and
users workstations will be using the same network.  The question is: would
I need a QOS device to give SIP traffic a chance?  Our internal network is
100M.  We will have a ISDN30 for outgoing calls.  No calls will be made
over the internet.


Thank you in advance!

Phil

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Re: [Asterisk-Users] Do we need a QOS switch ?

2006-02-05 Thread stoffell
On 2/5/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> We have 10 people on our network and each person will have a SIP phone
> connected to our Asterisk server.  All phones, Asterisk, other servers and
> users workstations will be using the same network.  The question is: would
> I need a QOS device to give SIP traffic a chance?  Our internal network is
> 100M.  We will have a ISDN30 for outgoing calls.  No calls will be made
> over the internet.

If you have a fairly decent 100Mbit switch, you'll be fine. I assume
you will make up to 10 simultaneous calls, so you can calculate the
bandwidth you'll be using.
(http://www.voip-info.org/wiki/view/Bandwidth+consumption) When using
the G.711 codec, it'll be about 1.5-2Mbps when doing 10 simultaneous
calls.

If you don't overload your internal network, you'll be fine..

cheers
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Re: [Asterisk-Users] Do we need a QOS switch ?

2006-02-05 Thread Rusty Shackleford

stoffell wrote:

On 2/5/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
  

We have 10 people on our network and each person will have a SIP phone
connected to our Asterisk server.  All phones, Asterisk, other servers and
users workstations will be using the same network.  The question is: would
I need a QOS device to give SIP traffic a chance?  Our internal network is
100M.  We will have a ISDN30 for outgoing calls.  No calls will be made
over the internet.



If you don't overload your internal network, you'll be fine..
  
Ah... THERE is the key phrase we were looking for. The proposed VOIP 
traffic will have little impact on the usability of their network FOR 
VOIP traffic. It is all the other stuff that runs across their LAN that 
make make VOIP "a really cappy idea", if the don't take steps to ensure 
that the VOIP traffic is managed properly. With the paucity of details 
provide by the OP, it is impossible to say, with any degree of 
credibility, that the "...will be fine..."


Do those 10 phone sit on the desks of graphic designers, whose file and 
print traffic can bring a 100 Mbps segment to its knees?

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Re: [Asterisk-Users] Do we need a QOS switch ?

2006-02-05 Thread pdhales
> Hi,
>
> We have 10 people on our network and each person will have a SIP phone
> connected to our Asterisk server.  All phones, Asterisk, other servers and
> users workstations will be using the same network.  The question is: would
> I need a QOS device to give SIP traffic a chance?  Our internal network is
> 100M.  We will have a ISDN30 for outgoing calls.  No calls will be made
> over the internet.
>

As long as the current infrastructure is decent, you should be fine without
a separate voice switch.

PaulH

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Re: [Asterisk-Users] Do we need a QOS switch ?

2006-02-05 Thread Ron Senykoff
> >> We have 10 people on our network and each person will have a SIP phone
> >> connected to our Asterisk server.  All phones, Asterisk, other servers and
> >> users workstations will be using the same network.  The question is: would
> >> I need a QOS device to give SIP traffic a chance?  Our internal network is
> >> 100M.  We will have a ISDN30 for outgoing calls.  No calls will be made
> >> over the internet.
> >>

We have dealt with this issue in small offices by using phones that
contain a switch (Polycom IP500s) and do their own QoS. In other
words, all the users' PCs are hooked into their phone, so any
excessive traffic does not interfere with the phone. Since the phones
then hook directly into the same switch that the PBX (Asterisk) hangs
off, quality has been fine. Keep in mind this is for small offices
like you describe. Provided the topology of your switches is OK, you
should be fine. Just don't uplink to another switch where you can
create a non-QoSd bottleneck link.

-Ron
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