Answer to ATA command comes after a long time

on software 657_09gg.Q2406B 1954500 102706 18:44, running on a Q2406 module, once the data mode is on (AT+WIPDATA=2,1,1 is sent) and multiplexing mode (AT+WMUX=1 is sent) using the module on TCP client socket mode, if an incoming call arrives, the module waits about 15 seconds before returning a OK to the command ATA.

Do you know if this will be corrected in the last software release ?