[Serusers] too many 487 to caller

[kaiser]

Hi,
I have a problem about 487 retransmit...
After caller get a 18x from ser proxy, we cancel the call, we could see caller UA send a CANCEL message and get a 487 message from proxy.
UA get 487 message then reply a ACK.. but proxy still send next 487 again and again.
We check called party, no such problem, only one 487 received.
Could anyone give me a hint?
best regard
Kaiser
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