The IS41 GSM Migration (IGM) feature must be enabled before the is412gsm, gsm2is41, migrpfx, or serverpfx parameter can be specified.
Recovery
Display the status of the IGM feature. Enter the rtrv-ctrl-feat command.
If the feature does not appear in the output, then the feature is not enabled. If the feature has a status of OFF, then the feature is enabled but is not turned on.
Enable the IGM feature as necessary. Refer to IS41 GSM Migration User's Guide for assistance.
Re-enter the chg-gsmopts command that generated this error message.