47) Resource unavailable, unspecified disconnection cause for both side call via SIP - Cisco Community
VoIP/SIP 481 Call Leg/Transaction Does Not Exist (AUD-560) · Issue #209 · espressif/esp-adf · GitHub
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Matt Landis Windows PBX & UC Report: Step by Step Installing Lync Server 2013 Persistent Chat Collocated on Standard Edition Front End - Part 3
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