Bug #16817
open
Unable to make specific outbound VOIP calls unless "Disable hardware checksum offload" is checked on system_advanced_network.php
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Description
Details:
Hardware:
• Netgate SG4860, in place for 5+ years, no recent settings changes.
• Sangoma P325 VOIP phones connected to an externally hosted Switchvox software PBX; system in place for 2+ years, no recent settings changes.
• When pfSense+ firmware was updated from 25.07.1 to 25.11.1, the bug seemed to be introduced. Bug persists in 26.03.
When we (USA based) place outbound long-distance calls without the country code, they fail to go through, despite the fact that our switchvox software has a rule that should "add" the "+1" automatically. In other words, functionally, dialing "555-555-5555" should be exactly the same as dialing "1-555-555-5555." From the software hosting provider NOC: " ...the call is not being sent to the provider. Instead, the phone itself is not sending the second INVITE required for authentication to proceed due to this reason the fails. "
However, visiting system_advanced_network.php and checking the box to "Disable hardware checksum offload" then rebooting the device appears to resolve the issue.
Was there a driver change or is there another bug that may affect others? I understand that this may be specific to the SG-4860 so it may not be high priority, but if it is more widespread I would hope a solution could be found that helps more people.
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