This could be caused by the wrong plugin being used.
It can also be the wrong format of the data coming from the PABX.
This can also be caused by the End of Line character (EOL) being set to the
wrong character. Default it is char 10, but on The Ericsson it is most likely 13.
This value can be changed on the Communication screen of the PABX3.
Just change the 10 to a 13 by the EOL option.