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<span style="font-size: 10pt; ">> > Here is my IP-PBX setupmy setup is : sips softphone <-> asterisk <-> xorcom PSTN gateway <-> pstn line to telcoi'm using xlite for windows</span><br><div>> <br>> > when I make a phone call (sip - outgoing channel),I can hear my own voice so clear. it's very annoying mewhen talking a little loud... any solution? <br>> <br>> Two questions:<br>> <br>> (1) Does the problem occur when you make a SIP-to-SIP call, without<br>> the PSTN being involved?<br><br>No, it's happened only when I make a call from sip to pstn line.<br><br>> (2) When you hear your own voice in the headset, is it delayed, or<br>> is just an immediate louder-than-you-want "side-tone"?<br><span style="font-size: 10pt; "><br></span></div><div><span style="font-size: 10pt; ">it's immediate voice and very clear, just like "talk-to-my-ear" with no delay</span></div><div><span style="font-size: 10pt; "><br></span></div><div><span style="font-size: 10pt; ">> If it *does* occur in SIP-to-SIP calls, this would rule out your</span><br>> XORCOM and the PSTN as the cause. If it's only occurring in<br>> SIP-to-PSTN calls, then the XORCOM and PSTN (or the interaction<br>> between them) is a likely suspect.<br>> <br>> There are several things which can cause this sort of problem.<br>> <br>> (A) Direct acoustic feedback within the headset. In this case, you'd<br>> probably hear it even if the headset was unplugged entirely. The<br>> only cure is to buy a better headset.<br>> <br>> (B) Incorrect audio-mixer settings in your PC. To the PC audio<br>> infrastructure, a headset usually "looks like" a microphone<br>> and a separate speaker. The audio mixer (hardware and software)<br>> usually has an ability to mix some of what the microphone "hears"<br>> into the speaker output. If this "knob" is turned up too high,<br>> you'll hear your own voice too loudly. If too low, you won't<br>> hear your own voice at all when you speak into the headset, and<br>> many people find this lack of side-tone to be confusing.<br>> <br>> The cure here is to adjust the audio side-tone level, either<br>> in your Windows audio-mixer control panel, or in X-Lite (if<br>> it has such an adjustment).<br>> <br>> (C) Electrical "reflection" from an analog impedance discontinuity<br>> in the analog telephone-line system. This can result from<br>> a mismatch between the telephone wiring, and the PSTN interface<br>> device, and can occur at any point in the analog transmission.<br>> <br>> If the loud side-tone you hear is *not* delayed noticeably,<br>> then the impedance mismatch might be at your XORCOM/PSTN<br>> interface. The XORCOM may have a software adjustment or<br>> jumper setting, to match its audio impedance to that of your<br>> local phone line... try fiddling with these settings to see<br>> if they reduce the excessive side-tone level.<br>> <br>> If the loud side-tone you hear is delayed (it sounds a bit<br>> like an echo) then it may very well be at the "far end" of<br>> the phone line, outside of your own physical control... it<br>> might be at your local phone office, or anywhere between you<br>> and the far end of the phone connection. Not much you can do<br>> about this.<br>> <br>> (D) Audio feedback at the far end of the call, in a cheap phone<br>> handset. Sometimes, audio from the "back side" of the speaker<br>> in a handset travels through the body of the handset and is<br>> picked up by the microphone, and results in an audible delayed<br>> "echo" of the voice from the far end of the line. Using a<br>> better handset, or stuffing the handset full of audio damping<br>> material (cloth or cotton or fiberglass) is the cure here.<br><br></div><div>Well, thanks a lot Lee for suggestion and explanation, I'll try this tommorow.<br><br><span style="font-size: 10pt; ">> </span><br>> We've often faced this problem with SIP soft phones when the computer's <br>> sound system gain was set too high. You usually have to play around <br>> with microphone gain settings to get to the point where the echo <br>> disappears with the other party still being able to hear you.<br><br></div><div>And thanks for your share Raj, I appreciate that..</div> </div></body>
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