REFER throwing `481 Call Leg/Transaction Does Not Exist` · Issue #6 · sippy/go-b2bua · GitHub
VoIP/SIP 481 Call Leg/Transaction Does Not Exist (AUD-560) · Issue #209 · espressif/esp-adf · GitHub
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REFER throwing `481 Call Leg/Transaction Does Not Exist` · Issue #6 · sippy/go-b2bua · GitHub
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Lync 2013 and Office 365 voicemail calls failing with 481 call leg does not exist – irrationale
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