Error
It is not possible to send SDS or make simplex calls in MSISDN/phone mode.
Error message: Failed to send / service denied
Environment
TETRA, MXP7000, MSISDN, MR2023.1
Root Cause
Software
Workaround/Fix
MS-ISDN dialing for Simplex call and SDS via MS-ISDN/PSTN/PABX is not supported.
MS-ISDN dialing for Duplex calls (Private and PSTN) requires upgrade to MR2024.2.