Sierra FXT009 ERROR 88

Hello!
I use FXT009 and I need to contact another gsm - modem on CSD channel for data transmission.
When you call the command modem
ATD8978 … 93
outputs NO CARRIER
After the team
AT + CEER outputs + CEER: Error 88
What kind of error 88?
Thank you!

Hi,

Its in the manuals, it will have been returned to the unit directly from the network.

88 Incompatible destination

Regards

Matt