Contact Header Processing
The Contact header mapping matches a Contact header that contains the refer to URI prefix to the corresponding Contact header that the Oracle® Enterprise Session Border Controller’s SIP B2BUA re-originates. Contact headers that do not contain the refer to URI prefix are not mapped (so that performance of the Oracle® Enterprise Session Border Controller is minimally affected).
Only the Contact header in an INVITE request and its 200 OK response are checked for the refer to URI prefix and added to the Contact header mapping. Contact headers appearing in other SIP requests/responses are not checked.