Solution:
Some applications will require entering a default string for the modem type. Below is a default init string:
PCI-RAS v.90
AT&FE0V1&C1&D2+MR=2;+DR=1;+ER=1
PCI-RAS v.92
AT&FE0&C1&D2V1\V1
Note: some applications require a carriage return at the end of the string
Please refer to the Command Set manual for the complete AT commands.