SIP 481 error code - Cisco Community
REFER throwing `481 Call Leg/Transaction Does Not Exist` · Issue #6 · sippy/go-b2bua · GitHub
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47) Resource unavailable, unspecified disconnection cause for both side call via SIP - Cisco Community
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VoIP/SIP 481 Call Leg/Transaction Does Not Exist (AUD-560) · Issue #209 · espressif/esp-adf · GitHub
REFER throwing `481 Call Leg/Transaction Does Not Exist` · Issue #6 · sippy/go-b2bua · GitHub
Your chatroom functionality may be limited due to an outage" client error after adding new Central site to SfB topology
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wireshark - SIP Error 481 Call/Transcation Does Not Exist when transferring - Stack Overflow
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47) Resource unavailable, unspecified disconnection cause for both side call via SIP - Cisco Community
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47) Resource unavailable, unspecified disconnection cause for both side call via SIP - Cisco Community
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Lync 2013 and Office 365 voicemail calls failing with 481 call leg does not exist – irrationale
