Change in MS Teams VoIP after upgrade from 7.2.10 to 7.4.5 with one way voice

[p_m_silva]

We have been using MS Teams voice calls without issue on multiple sites for a few years.

Recently we upgraded from 7.2.10 to 7.4.5.

We are seeing intermittent problems with one way voice which started being reported in the week after the upgrade.

It could be coincidence but I am wondering if anyone has experienced the same?

We have the SIP Helper and ALG turned off and have been operating like this without issue since we implemented Fortigate on 6.4.x

Thanks

Pedro

[Anthony_E]

Hello Pedro,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

[Anthony_E]

Hello Pedro,

I may found an answer to your question: how to troubleshoot the one-way voice issue in MS Teams VoIP after upgrading from FortiOS 7.2.10 to 7.4.5,

1. Check SIP ALG Configuration:  Verify that the SIP ALG settings are correctly configured on the FortiGate device. Ensure that SIP ALG is enabled and properly configured for MS Teams VoIP traffic.
2. Clear Sessions: Clear all sessions related to the VoIP traffic passing through the FortiGate device. This can help in resetting any existing connections that might be causing the one-way voice issue.

diag sys session filter clear

diag sys session filter dport <VoIP port>

diag sys session clear

3. Restart Phone System: It is recommended to restart the phone system after making any changes to the FortiGate configuration to ensure that all devices establish new connections properly.
4. Verify Network Configuration:  Check the network configuration to ensure that there are no routing or firewall issues causing the one-way voice problem. Verify that the necessary ports for MS Teams VoIP are open and correctly configured.
5. Monitor Traffic: Use tools like packet capture or traffic logs on the FortiGate to monitor the VoIP traffic flow and identify any anomalies or issues that might be causing the one-way voice problem.