VOIP switch

I need to add a network switch, we are using two 3COM 4200G switches now.
I want to make sure choice a 24 port 1GB switch that will work with VOIP.
Any recommandations are appricated. Also does it have to be a switch that has QoS?
I'm looking at this switch:

jsarinanaI.T. ManagerAsked:
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Nick RhodeIT DirectorCommented:
I am a fan of the Cisco SG300 1gb POE switch.  Price range varies on amount of ports or if you want POE etc.  Works great.

Overview: https://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps10898/brochure_c02-610054.pdf

Sample Interface:   http://www.cisco.com/assets/sol/sb/Nikola_GUI/SG_300-28P_v1_1/config/home.htm

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If you take a little care in designing the network then you dont need QoS. QoS is only used where you are going to have congestion where some packets are going to be dropped. QoS ensures its the non voip traffic which is dropped.

A regular computer is not going to be able to saturate 99.9% of a gigabit link so a separate voip phone is going to have enough bandwidth even if it shares a port with the computer. Switches have enough backplane bandwidth that internally they wont become saturated. The most common are for congestion is the link between switches. If you put voice on a separate VLAN and dedicate a cable interconnect just for this then you avoid the issue. So you ideally need a switch which supports VLANs and an additional cable interconnect between multiple switches.

The previous poster mentioned PoE and this supplies power to the phones over the network connection. You can power each phone via a mains adapter but using PoE saves additional cabling and because power comes from a central location you can insert a UPS and enable the telephone system to continue to function for a while if there is a power failure.
jsarinanaI.T. ManagerAuthor Commented:
Thanks for the info. I ordered a Cisico GS300 28P

We have two offices both have dual T1 connections and both have a Toshiba phone system
The main office has a PRI for phone and the smaller office has a SIP setup for phones
So they both use phone lines which work great

the phone sysems are also configured so when someone calls small office it rings in the main office, we can also use extentions to talk to each other in both offices which is done over the internet connections. this is where we get low quality, if you call directly the quality is much better. I was looking in the main office and I notice a small linksys LAN switch using 3 ports
one from the T1 connection, one to my Firewall on the main LAN and one to our phone system. I'm wondering if this small Linksys switch is the right switch that we should be using? any suggestions? maybe a more sutable switch is in need?
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The switch is not going to matter. A T1 is still quite a slow internet connection. Is this internet connection only being used by voice?
I am guessing not.

The first thing I would do is make a test call at a quiet time and temporarily disconnect the firewall from the small switch. That way you know the internet is not being congested so can rule out that as a possibility.
You can do a similar thing at the smaller site.

If the quality improves then its a congestion issue. Its possible to do some QoS over the internet connection depending on what type it is but the best way is generally to just have a dedicated connection for the voice traffic.

If the quality doesnt improve then it might be that the audio compression codec being used is causing the issue. You could switch to a different higher quality codec.
jsarinanaI.T. ManagerAuthor Commented:
jsarinanaI.T. ManagerAuthor Commented:
Got my SG300-28P works great, only one thing, I can't count I need a 48 or 50 port POE switch
Any suggetions, I looked up SG300 products on www.newegg.com but can't seem to find a POE with 48 ports?
jsarinanaI.T. ManagerAuthor Commented:
Never mind I found it, sorry to bug, can't count and see....
jsarinanaI.T. ManagerAuthor Commented:
The switch looks very good. The way the newegg has the specification written is quite misleading though. The main 48 ports are only 10/100 with POE support. The additional ports are non POE but are gigabit and designed for uplink to other switches.

If you want a true gigabit switch so you have gigabit to the desktops (if they are using the same switch) then look at the SG300-28MP instead. This switch is probably going to be a lot more expensive. If its only being used to connect to phones then there is no point going for gigabit.

Another option is to get a non POE gigabit switch and get a POW midspan such as http://www.microsemi.com/products/powerdsine/powerdsine-3500g-family. This sits inbetween the switch and the phones injecting power when required. It effectively turns regular 10/100 or 1000 switch ports into POE ones. A little more patching would be required but if you wish to have a gigabit switch where nowhere near all ports will be supplying power it can work out a cheaper option. However there is a lot to be said for having all ports POE capable so you can just move a phone and dont have to go to the server room to patch the new port into the POE midspan if the phone doesnt work.
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