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vgonzalez
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January 7, 2022
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Zoom client P2P calls port range

  • January 7, 2022
  • 5 replies
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Does anyone know what port range is used when a zoom client calls another user answering on a zoom client? it doesnt use the 20k+ range that goes back to zoom but uses TCP ports somewhere in the 9000+ range from testing with wireshark.

 

This communication flow is undocumented and I am trying to refine our QOS policy to apply tags on P2P voice traffic along with audio traffic that goes directly to zoom.

    Best answer by Dan_ZoomSE

    is the port range known? I am assuming it is hard coded in the client or is brokered through Zoom's servers to tell the clients what ports to negotiate on.


    @vgonzalez,

     

    My colleague has just confirmed that this port range is:

    Ports 9000-10000

     

    We are working to get this updated on our Firewall Rule Support Article.

     

    If this has answered your question, please click the Accept as Solution button below so that others in the Community may benefit as well.

    Thanks!

    5 replies

    Dan_ZoomSE
    Employee
    Dan_ZoomSE
    Employee
    January 7, 2022

    Hello @vgonzalez ,

     

    This is configurable in your Account Settings:

     

     

    If this has answered your question, please click the Accept as Solution button below so that others in the Community may benefit as well.

    Thanks!

     

    V
    Explorer
    vgonzalezAuthor
    Explorer
    January 7, 2022

    seeing that this specifically mentions meetings, is this including both audio and video? does this also include a phone call, which is not a meeting? Thanks for the quick response BTW!

    Dan_ZoomSE
    Employee
    Dan_ZoomSE
    Employee
    January 7, 2022

    This would be for meetings (audio/video) and does NOT apply to Zoom Phone.  Zoom Phone uses TCP 5091 for signaling and UDP 20000-64000 for media.

     

    If this has answered your question, please click the Accept as Solution button below so that others in the Community may benefit as well.

    Thanks!

    V
    Explorer
    vgonzalezAuthor
    Explorer
    January 7, 2022

    I have two QOS Policies for zoom phone one for the destination port 5091 and the 20k range to apply QOS on our windows machines. When making an outbound call through the PSTN the call falls into those ranges and QOS is applied. When making a P2P zoom phone call is seems that is is using the 9k range when looking at wireshark, but unknown what the full range is.

     

    How can I get a feature request for a P2P meeting setting the port range to have it separated out between audio and video? we want audio to have a higher priority than video. Meetings that are not P2P going back to zoom that is easily definable referring  to the zoom network guide overlooking the port ranges.

    Dan_ZoomSE
    Employee
    Dan_ZoomSE
    Employee
    January 7, 2022

    All feature requests are managed within our https://zoom.us/feed submission form. We encourage you to submit this idea there, where the information will then be passed along to the relevant product team for review.

    V
    Explorer
    vgonzalezAuthor
    Explorer
    January 7, 2022

    any thoughts on zoom phone peer 2 peer? on controlling the port range or what they are?

    Arps
    Community Champion | Employee
    Arps
    Community Champion | Employee
    January 12, 2022

    Hello!

     

    Zoom Phone peer to peer traffic will be from the source ports that both zoom clients are using for the client to cloud traffic.  

    Ex:

    Client A sources from 9123 and goes to port 20000 in the cloud
    Client B sources from 9456 and goes to port 20001 in the cloud

    Client A will source with 9123 and go to 9456 on client B

    Client B will source from 9456 and go to 9123 on client A

     

    So all that to say, it's lower ephemeral range UDP ports that are chosen at the client level.  It's not something that can be set by the user or admin.

     

    Hope that helps and please make sure to mark the solution as accepted if this information is what you needed.

    Thanks! Rick

      V
      Explorer
      vgonzalezAuthor
      Explorer
      January 12, 2022

      is the port range known? I am assuming it is hard coded in the client or is brokered through Zoom's servers to tell the clients what ports to negotiate on.

        V
        Explorer
        vgonzalezAuthor
        Explorer
        March 11, 2022

        Still having issues, confirmed the calls are dropping because the zoom controller is not getting the keepalives and instructing the clients to end the call. Waiting to get confirmation on the port or port ranges used for the keep-alive, along with if they have any internal documentation on how to Qos voice/video separately in windows instead of giving zoom.exe Qos for all TCP/UDP port ranges.

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