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New here and have QOS question(s)

Discussion in 'General Discussion' started by whispers, Jun 24, 2005.

  1. whispers

    whispers Network Guru Member

    Hi gang. Im new here so if there a place to read up on this..or is this has been asked before.. dont flame to bad..not sure where the FAQ or what not are.

    At my company, I was told by the owner..thast the new expansion for new employees with be using VoIP for the phone. SO the computer and the phone can share the same line. (He thinks this will same money instead of just running an extra cat5/6 cable when the original cat5/6 cable is run.)

    Anyways.. we use a company/software called Altigen for our phone stuff. The account rep over there said that to use the VoIP stuff..we need to make sure out network is QOS enabled.

    Im not really sur ewhat Quality of Service really entails..anybody help me out?

    Now..our network consists of a Cisco Router and Cisco Pix Firewall at our front door.... then we have 4 Netgear hubs/switches 3 for out LAN..and 1 for the DMZ (one of these is a gigabit switch)

    This is where I am... what actually needs to be QOS enabled? The switch the lines the phones/computers are directly connected to? the Cisco Router? I called Netgear they said all switches are unmanaged switches..and NOT QOS enabeled...

    I use linksys at home..never have any problems really. SO Im looking for a solution...on how this can work..or at least get soime REAL information so I can ask more intelligent questions and have some facts.

    Im new to all this QOS stuff..so be gentle..LOL
    Thanks
     
  2. DevilStick

    DevilStick Network Guru Member

    QoS = Quality of Service

    This means you can decide which of your service gets how much bandwidth and what priority. This prevents that when downloading large files or having other heavy network loads, your voip packets get delayed and case breaks in your call.

    This means every switch in your lan has to support QoS. With your unmanaged netgear switches, you will have a problem in priorizing voip packets (RTP traffic).

    Usually cisco router support QoS and cisco PIX supports QoS in the lastest firmware (7.0). So you will have to upgrade your pix firmware.
    But first you have to know where voip is used at all. When you have a voip gateway with a PSTN-Interface for outgoing calls and you use voip just internally, then devices which connect you to internet will not need QoS.

    Only when you also use voip with public voip providers or to call branch offices, e.g via VPN, firewall and wan-router will need QoS for voip traffic.

    My advice for you:

    First buy managementable lan switches which support QoS and voice-vlans to separate data and voice traffic and priorize last one.
     
  3. whispers

    whispers Network Guru Member


    this part:"Usually cisco router support QoS and cisco PIX supports QoS in the lastest firmware (7.0). So you will have to upgrade your pix firmware.
    But first you have to know where voip is used at all. When you have a voip gateway with a PSTN-Interface for outgoing calls and you use voip just internally, then devices which connect you to internet will not need QoS.

    Only when you also use voip with public voip providers or to call branch offices, e.g via VPN, firewall and wan-router will need QoS for voip traffic."

    way over my head..LOL..sorry I didget that the Cisco stuff probably supports it...but may need a firmware update.

    Now...all the switches we currently have NEED to have QOS suport? Cant we just buy a couple new ones (or one)..for the NEW people/section/office expansion for THOSE "phone/computer" systems??

    I guess what I need to find out..is does he want WHOLE office on VoIP?..or just the new section (right?)..if the whole office..then all new switches are needed... if only the new section..then a NEW QOS enabled switch is needed....which will plug into the QOS router/pix (if they are supported)

    Am I following so far?

    thanks
     

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