Hi Jean, Expires with zero is generally used for de-registration.This is a case where you receive for first REGISTER message you can silently discard and go ahead. No need to maintain the transaction. Does your 200OK has Expired header as well as Expires parameter in Contact header. If So, Contact header "expires" paramter has preference over Expires header, if expires in contact is present, it will be used else value present in Expires header will be used. Thanks & Regards, Kavitha Menneni
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