one-way-audio
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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 - no NAT and the required ports on Firewall are open) For some of the incoming calls (PSTN --> SBC --> Microsoft Cloud --> Teams Client) the caller does not hear the MS Teams user. It happens randomly. In the SBC logs i see that the same caller had other succesful calls with the same MS Teams without any issues. So it should not be a configuration issue. Comparing these two calls (one with two-way audio and one with one-way-audio), the only difference I see is, that Microsoft is not sending a RE-INVITE during call setup. (In every succesful call Microsoft is answering the initial INVITE with an 200 OK with SDP and then sends a RE-INVITE to the SBC where the IP address for RTP in SDP is modified) Can someone help me with this issue? I could provide SIP logs for good and bad calls. Thanks & Regards, LeventSolved8.4KViews0likes7Comments