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What is Replaces Header Field in SIP?

Replaces header field is used for substituting or replacing an existing call with a new call.

1. A UA in an established dialog receiving another INVITE with a Replaces header field that matches the existing dialog must accept the INVITE, end the existing dialog with a BYE, and move all resources and state from the existing dialog to the newly established dialog.

2. If the Replaces header field corresponds to no dialog, the INVITE must be discarded or rejected with a 481 Dialog Does Not Exist response.

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