Change which account call goes out on

[tsukraw]

Ok looking at the manual i see
Enter the desired line ID in the Account field or leave it blank.
If you leave the field blank or enter 0, the dial-now rule will apply to all accounts on the IP phone.

So if i understand correctly the part about leaving the field blank or enter 0 means that if nothing is entered it will automatically call out whichever line is active for the call correct?