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Hello,In the company I work for, we are running (really old) CUCM 11.5.1 / IP Phone 7841 and using SIP TRUNK as external gateway.Some people in my comany reports blank calls (no audio in either direction) for certain numbers while other ones are work...

JELA_2-1694183044134.png JELA_1-1694181890118.png JELA_0-1694181729092.png
JELA by Level 3
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000966: Oct 11 2023 17:14:40 WIB: %SIP-3-INTERNAL: Connection failed for addr=52.114.76.76, port=9610, connId=15602 000967: Oct 11 2023 17:15:30 WIB: %SIP-3-INTERNAL: Connection failed for addr=52.114.76.76, port=5061, connId=15599 000968: Oct 11 202...