I have NEC DSX-160 I I have NEC DSX-160 I put Line-in 8COIU card & the card is work fine for incoming & outgoing calls. My Question is when the first line be come busy no one can use the others line-in service ,how i can more...
Un able to make calls i just added centrex lines and now my phone lines are all busy.We can receive incoming calls, but are unable to dail out.It says more...