The time I/S down the CSCF at RST, if UE is the RST to Register call the CSCF/S, I will send the code 504, so SNK UE then Register the new SNK, to call out, but from the test found that the UE (Samsung, iPhone and EagleX) made a new call to register. Huawei has long way to change code from 502, 504, is not expected to make a new register issue at UE.
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