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REFER throwing `481 Call Leg/Transaction Does Not Exist` · Issue #6 · sippy/go-b2bua · GitHub
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Cannot tranfer PSTN Skype calls: sip 481. Cal Leg/Transaction does not exist
REFER throwing `481 Call Leg/Transaction Does Not Exist` · Issue #6 · sippy/go-b2bua · GitHub
attended transfer failed: 481 Call Leg/Transaction Does Not Exist/INVITE | 3CX Forums
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Your chatroom functionality may be limited due to an outage" client error after adding new Central site to SfB topology
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VoIP/SIP 481 Call Leg/Transaction Does Not Exist (AUD-560) · Issue #209 · espressif/esp-adf · GitHub
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47) Resource unavailable, unspecified disconnection cause for both side call via SIP - Cisco Community
