after completing a call with no problems earlier this morning.I ran into an issue attempting to make additional calls from my Panasonic home phone landline, KX-TG7871. I could connect to the party called but after the initial first word they could no longer hear me or recognize any number pressed on my receiver although I could hear them fine. I tried this on all the different receivers with the same results, I was wondering if this is a phone problem or is a problem on the line?