Channel/Socket Contention

There can only be one active request per channel at any one time. Any attempt to use a channel that is already in use is taken as an implicit cancellation of the in-progress session. However, this rule is implemented differently on channel 0 and 1. On channel 0 (POs to EFTLink), the new request (typically a payment request) is rejected as "busy" and the active session is left to run to completion. On channel 1 (EPS to EFTLink), the old session is aborted, and the new request (typically a display request) is processed as the new active session.