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Trouble shooting a scenario where Source remap is causing the VOIP issues

03/26/2020 180 People found this article helpful 214,110 Views

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    Description

    Trouble shooting a scenario where Source remap is causing the VOIP issues

    Resolution

    SCENARIO / SYMPTOM

    •    A PBX system contains 8 lines/extensions on the same device

    •    Each line is assigned with separate extension numbers

    •    Each line communicates with the PBX server with a particular source port (5060, 5160, 5163 etc..)

    •    When the phone system initiates a SIP message for registration with the PBX server, each line/Extension communicates with their specific port configured on this phone system

    •    When the traffic reaches the SNWL, it remaps each source port to another random port and sends it to the PBX server

    •    The PBX server is already pre-configured to assign an extension to each source port which the phone communicates with

    •    When the PBX server identifies a different random port number, it does not assign those extension to the phone, and those lines don’t work

    RESOLUTION/WORKAROUND

    •    Create a NAT policy from LAN/VOIP zone or Phone system IP address to WAN by translating the LAN/VOIP subnet to WAN IP with destination as any and services as any

    •    Go to advanced tab and enable the option “Disable Source port remap”

    •    This option should allow the SNWL to forward the source ports without any modification

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