[Serusers] Processing REGISTER REQ section 10.3

Hello, As per section 10.3 step 6 the bindings must not be removed if there is an incoming REGISTER request with... CallID==One stored CSeq==Same as stored Contact : * Expires: 0 But I found SER Registrar implementations removing the bindings and sends 200Ok.It should have dropped the request. Any thoughts or inputs?? Thanks karthikeyan Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or Mailadmin(a)wipro.com immediately and destroy all copies of this message and any attachments.