REFER-Initiated Call Transfer
The Oracle® Enterprise Session Border Controller supportes REFER-initiated call transfer either by proxying the REFER to the other User Agent in the dialog, or by terminating the received REFER and issuing a new INVITE to the referred party. These static alternate operational modes can be configured for specific SIP interfaces, realms, or session agents.
An additional operational mode can determine on a call-by-call basis whether to proxy the REFER to the next hop, or terminate the REFER and issue an INVITE in its stead.
The configuration parameter dyn-refer-term, and refer-call-transfer parameter specify call transfer modes.
With the refer-call-transfer parameter set to disabled (the default), all received REFERs are simply proxied to the peer User Agent.
With the refer-call-transfer parameter set to enabled, the Oracle® Enterprise Session Border Controller terminates all REFERs, generates a new INVITE, and sends the INVITE to the address in the Refer-To header.
With the refer-call-transfer parameter set to dynamic, the Oracle® Enterprise Session Border Controller determines REFER handling on a call-by-call basis as follows: