ECB PUBLIC Questions and Answers Question : Determination of outbound communication channel for payment instructions/files If Bank A sends a payment order (smaller than 32 KB) via store-n-forward file-based to ESMIG/T2, how is the communication channel for the outgoing payment (payment message to Bank B) determined by ESMIG/T2? Will ESMIG/T2 derive it solely based on the size of the message (similar as for query responses; ESMIG UDFS 1.4.3)? [ i.e. in the example above store-n-forward message-based would apply outbound] Or will the outbound channel by default follow the inbound channel and only in case of oversize deviate from the inbound channel? [i.e.
in the example store-n-forward file-based would apply] Answer: Inbound and outbound channel communication are independent from one another in RTGS. When RTGS is ready to forward the message to the Addressee, it first checks the routing information provided in the addressee PTA. If the forwarded message is bigger than 32KB, it will automatically be flagged as a 'File' when routed to ESMIG and ESMIG will use the SnF File channel to send the message. 13 www.ecb.europa.eu ©