Forum Discussion
Failed of Direct Routing for MS phone system and Cisco CUBE
Hi everybody, I am establishing a MS direct routing with Cisco gateway. After the configuration on both Microsoft and Cisco. We can make a phone call with audio stream on both endpoint. (Cisco ...
Torren Manson is right.
We faced similar behavior: In our case the certificate was installed OK, but we mistakenly used other trustpoint within 'sip-ua' section
https://community.cisco.com/t5/ip-telephony-and-phones/syslog-error-on-cube-sip-3-internal-tcp-socket-send-blocked/td-p/2794165
Please refer this blog, you will get their is TCP connect block due to this TLS is also blocking.