Hi all, I just purchased a Polycom 301 for my home office and I believe I have it setup correctly as I can dial out, receive calls in, etc. However, I'm having the following issue: When calling a local number over a Zap line, I hear a lot of feed back on the line. I had a Grandstream configured with the same information before I got the 301 and never had that kind of feedback noise. I've tried playing with rxgain/txgain and it doesn't seem to make a difference. If any one could offer a pointer on where to look to resolve this issue, I'd very much appreciate it. Thanks, -- Warm Regards, Lee
Lee Jenkins wrote:> > Hi all, > > I just purchased a Polycom 301 for my home office and I believe I have > it setup correctly as I can dial out, receive calls in, etc. However, > I'm having the following issue: > > When calling a local number over a Zap line, I hear a lot of feed back > on the line. I had a Grandstream configured with the same information > before I got the 301 and never had that kind of feedback noise.Feedback? As in high-pitched squealing? I can't imagine any circumstance under which a SIP phone would even allow feedback. Maybe you mean echo? You might also be talking about sidetone, which is the portion of your own voice that the phone pipes back to you so that you can adjust your voice accordingly. Sidetone can be set in the phone configuration; before you do that, though, I need to know what you mean by feedback. -Stephen-
Lee Jenkins wrote:> > Hi all, > > I just purchased a Polycom 301 for my home office and I believe I have > it setup correctly as I can dial out, receive calls in, etc. However, > I'm having the following issue: > > When calling a local number over a Zap line, I hear a lot of feed back > on the line. I had a Grandstream configured with the same information > before I got the 301 and never had that kind of feedback noise. > > I've tried playing with rxgain/txgain and it doesn't seem to make a > difference. If any one could offer a pointer on where to look to > resolve this issue, I'd very much appreciate it. > > Thanks, > >Solved. It turns out that it was the lines coming into my home from Verizon. I plugged a analog phone directly into the terminating jack and can hear the humming noise quite clearly. I never heard it until I setup the Polycom. My guess is that the GrandStream is either too great of a phone or too poor quality of a phone (i'll let you determine that one) to have picked up the noise like the Polycom did. This is why I never checked the line directly, I assumed it was the new phone since nothing else had changed. On the plus side, playing with the rx/txgain settings, Asterisk did minimize the noise pretty well. ;) -- Warm Regards, Lee