# Adding an Additional ESB Interface

You can add an additional TIBCO ESB Interface (formerly referred to as the Transformer) connection to a CICS region.

## Procedure

1. Add a Substation ES CICS Interface by performing the steps in Adding an Additional Substation ES CICS Interface.
2. Create a new ESB Interface member by copying the default ESB SIP member located in `USERHLQ.INTF`(`SXSIEMS1` or `SXSIRV1`) to a new name.
   This new member must have a different `INTF-ID` keyword value.
3. Change the new Substation ES CICS interface member value of `INTF-PARTNER` to match the new value of `INTF-ID` in Step 2.
4. Edit the Substation ES SIP member.
   The default value is `USERHLQ.INTF(SXSSIP$1)`.
5. Add a new `INTF-MEMBER` keyword, specifying the newly created ESB SIP member as the keyword value.
   For example: `INTF-MEMBER`=NEWINTF
   Note: Never specify identical `INTF-ID` values in the ESB SIP members.

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