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One-way-audio in some incoming calls from PSTN to MS Teams Client
Hi all, We have a direct routing setup in place and it is working fine for the most of the times. (2 x Cisco 4300 Series SBC with the supported SW version, SBC has a public IP assigned directly - ...
IT turned out to be a NAT issue, needed to modify firewall config. Now it is working properly.
Hi Levent,
Can you please check for the calls with One Way Audio what are the IP Address being used by the in the SDP Calls. Are those IP whitelisted on your firewall? Microsoft have made some changes to the IP Address and ports on the official documentations. Can you please refer to the same?
From my experience the issue only happens when there is a Port or IP Address block on the firewall. If you could share the logs I can look at the same.
With Regards,
Satish U
Can you please check for the calls with One Way Audio what are the IP Address being used by the in the SDP Calls. Are those IP whitelisted on your firewall? Microsoft have made some changes to the IP Address and ports on the official documentations. Can you please refer to the same?
From my experience the issue only happens when there is a Port or IP Address block on the firewall. If you could share the logs I can look at the same.
With Regards,
Satish U
Hi Satish, the IP range is up-to-date and allowed on the Firewall. Attached SIP messages for a good and a bad call. The only difference seems to be the RE-INVITE coming from MS.
