[cisco-voip] Post-Hangup Ringing (SIP)

[John Lyon]

Hi all, this one comes from the "I have no clue" department.  Heres the
scenerio:

Phone A (off-net) dials phone B (provisioned into BTS 10200).  Phone B rings
and phone A gets ringback.  Phone A hangs up before phone B answers.  Phone
B keeps ringing and ringing after phone A drops the call.

On the SIP side, a CANCEL message is sent to the BTS when phone A hangs up,
and the BTS responds almost immediately with a "481 Call Leg/Transaction
Does Not Exist."  The call ID and CSeq all line up throughout the call.  Any
ideas why the response from the BTS is a 481?

Thanks,
John
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