R49 Basis System: Communication error, CPIC return code 020, SAP return code 223
223 – Network read error

R49 Basis System: Communication error, CPIC return code 017, SAP return code 236
236 – No connection to the gateway

R49 Basis System: Communication error, CPIC return code 020, SAP return code 456
456 – Timeout when establishing connection

R49 Basis System: Communication error, CPIC return code 019, SAP return code 728
728 – Conversation ID not found