The phone number memory area will only allow 15 characters.

On the LCD, in "STATUS IDLE" ->"ADVANCED OPTIONS" ->"DIALBACKUP/LL OPTIONS" the number entry section will only allow 15 characters and you are no longer able to overwrite the buffer.

This was changed as of firmware version 2.310H.  The latest firmware can be downloaded from our Web site at:

MT5600BL: https://webfiles.multitech.com/modemfirmware/global/bkqg310l.zip