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GEN7-26633 VoIP Issue Detail Request

dsleedslee Newbie ✭
in Entry Level Firewalls

Can someone please provide more detail on this 'Resolved Issue' documented in the 7.1.1 release notes?

The description in the notes reads: "Inbound audio for both incoming and outgoing calls is unavailable when SIP UDP

frames are above certain size."

What is the 'certain size'?

Trying to determine if this is the source of some 1-way audio issues we have been seeing with clients.


Thank you,

David

p.s. please don't respond with 'just install 7.1.1 and see if the issue goes away'. As much as I'd love to do that, we need more information first.

Category: Entry Level Firewalls
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Answers

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    TKWITSTKWITS Community Legend ✭✭✭✭✭

    @TonyA @Community Manager

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    Community ManagerCommunity Manager Administrator

    Thanks for reaching out. I've pinged a few folks to gain clarity on this fix.

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    TonyATonyA SonicWall Employee

    Hi @dslee

    The failure occurs with a SIP UDP frame when the frame size is above certain value (7XX bytes). Hope this helps!

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    dsleedslee Newbie ✭

    Hi @TonyA

    Definitely exceeding that frame size. Is this an intermittent problem with the 7.0.1 firmware?

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    TonyATonyA SonicWall Employee

    Hi @dslee I believe in any instance where the frame size is above that value, you would see this issue.

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    KMBITKMBIT Newbie ✭

    This raises two questions for me... where would the frame size for UDP Traffic be defined? I would expect it be defined by the VoIP hardware but I am not sure.

    and the second question is: Under What situation/configuration does this happen?

    I have dozens of SonicWalls deployed running 7.0.x with VoIP being used. Is this only if you are using SIP Transformation on the SonicWall?

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    ArkwrightArkwright All-Knowing Sage ✭✭✭✭

    where would the frame size for UDP Traffic be defined?

    It isn't defined as such, it's determined by the payload. If you use some noisy application that adds lots of X-something headers to the packets then they will be bigger. The general advice if you have SIP packets getting near to the MTU would be to switch to SIP/TCP as it handles fragmentation better [but not really sure why that would be].

    This 7xx bytes thing is a Sonicwall-specific issue.

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