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VoIP phones PoE, 2930F

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  • 1.  VoIP phones PoE, 2930F

    Posted Feb 14, 2023 11:37 AM

    We recently switched to VoIP phones, and some phones are connected to PoE ports.  The phones are VVX350/450 phones, and they use about 5 volts, and that's what I'm showing on the PoE port.  But some phones restarts sometimes, so I'm trying to figure its a PoE issue or something on the phone carrier side.



  • 2.  RE: VoIP phones PoE, 2930F

    Posted Feb 14, 2023 11:41 AM

    When I look at the PoE switch port,  I don't see any errors.  I noticed there's an option for 'Power Priority', what does this do?  Its set to default 'low' now.




  • 3.  RE: VoIP phones PoE, 2930F

    Posted Feb 14, 2023 12:42 PM

    Just for comparison, I did the voip at my last job.  All Netgear switches, and my voip provider was Comcast.

    I did not had adjust any PoE on the Netgear switches, and that's what I'm doing with the Aruba switches.

    My current voip provider said it could be because the phones are not using TLS, but they switched us over to TLS, then rebooted phones but still having issue.




  • 4.  RE: VoIP phones PoE, 2930F

    Posted Feb 15, 2023 06:44 AM

    Hi Antony,

    Do you have CLI access on the switch?

    If so, enable debug mode with the commands below:

    debug destination session

    debug event

    Also check the PoE status on the interfaces:

    show power-over-ethernet brief

    Share the result with us.



    ------------------------------
    Leonardo Xavier
    Analista de Redes
    hcor
    acsa | acsp
    ------------------------------



  • 5.  RE: VoIP phones PoE, 2930F

    Posted Feb 15, 2023 07:23 AM

    hello t.antony


    Some devices use the LLDP protocol to negotiate PoE on the ports, check if this protocol is enabled on the switch with the command: show lldp config
    Also check if you are not hitting the load limit that your switch can deliver to IP phones

    Hope this helps.




  • 6.  RE: VoIP phones PoE, 2930F

    Posted Feb 15, 2023 08:46 AM

    Thanks for the replies, yes I'm using lldp, and I'll share debug results.




  • 7.  RE: VoIP phones PoE, 2930F

    Posted Feb 15, 2023 09:56 AM

    here's the results of sh power-over-ethernet,

    debug destination session, debug event didn't return anything.




  • 8.  RE: VoIP phones PoE, 2930F

    Posted Feb 15, 2023 10:02 AM

    here's the lldp info for port 12, which has a phone.




  • 9.  RE: VoIP phones PoE, 2930F

    Posted Feb 15, 2023 10:09 AM

    Antony,

    Try change the priority value on the interface

    power-over-ethernet critical



    ------------------------------
    Leonardo Xavier
    Analista de Redes
    hcor
    acsa | acsp
    ------------------------------



  • 10.  RE: VoIP phones PoE, 2930F
    Best Answer

    Posted Feb 15, 2023 10:19 AM

    ok I'll do that, what about PoE LLDP-MED?  Should that be enabled?