Hello list, this is the setup : analogue phone --> Grandstream GXW4008 --> Linksys WAG160N --> Asterisk-server (public) and Zoiper softphone --> Linksys WAG160N --> Asterisk-server (public) When calling with an analogue phone + Grandstream GXW and also when calling with the Zoiper softphone, we experience echo on both calling parties. Because the echo is there with the analogue phone AND with the Zoiper, I conclude that it is not the Grandstream GXW4008 gateway that is causing the echo. Could it be the router ??? These are the VoIP speed test results : VoIP test statistics -------------------- Jitter: you --> server: 4.2 ms Jitter: server --> you: off Packet loss: you --> server: 0.0 % Packet loss: server --> you: off Packet discards: 0.0 % Packets out of order: 0.0 Kind regards, Jonas. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20100630/d085733b/attachment.htm
Jonas Kellens wrote:> Hello list, > > this is the setup : > > analogue phone --> Grandstream GXW4008 --> Linksys WAG160N --> > Asterisk-server (public) > and > Zoiper softphone --> Linksys WAG160N --> Asterisk-server (public) > > > When calling with an analogue phone + Grandstream GXW and also when > calling with the Zoiper softphone, we experience echo on both calling > parties. > > Because the echo is there with the analogue phone AND with the Zoiper, I > conclude that it is not the Grandstream GXW4008 gateway that is causing > the echo. > > Could it be the router ??? > > > These are the VoIP speed test results : > > VoIP test statistics > -------------------- > Jitter: you --> server: 4.2 ms > Jitter: server --> you: off > Packet loss: you --> server: 0.0 % > Packet loss: server --> you: off > Packet discards: 0.0 % > Packets out of order: 0.0 > > > > Kind regards, > > Jonas. >Echo cannot be caused by a router. The zoipher softphone is probably being used with a headset and I suspect the microphone is picking up the sounds from the earphones resulting in echo. Try turning down the earphone volume to see if this helps. If it does invest in some better headphone preferably ones where the microphone has built in background noise cancelation. For the analogue phone it could be a similar issue. Some phones are better than others. Cant you use a proper SIP phone? They work so much better.
Thats the jitter buffer. It has no effect on echo. So you get echo when calling from the softphone to the analogue phone? What about when one of those calls somewhere else? What if they call a regular telephone number? How do you connect in order to send calls to normal phone numbers? Jonas Kellens wrote:> Hello, > > I stated in my first post that both ends hear an echo when one speaks to > the other... > > The only place where echo cancellation is being applied is in the > Asterisk server. I have the following in sip.conf : > > > ;------------------------------ JITTER BUFFER CONFIGURATION > -------------------------- > jbenable = yes ; Enables the use of a jitterbuffer on the > receiving side of a > ; SIP channel. Defaults to "no". An > enabled jitterbuffer will > ; be used only if the sending side can > create and the receiving > ; side can not accept jitter. The SIP > channel can accept jitter, > ; thus a jitterbuffer on the receive SIP > side will be used only > ; if it is forced and enabled. > > jbforce = no ; Forces the use of a jitterbuffer on the > receive side of a SIP > ; channel. Defaults to "no". > ;----------------------------------------------------------------------------------- > > > Thank you for your replies. > > Kind regards. > Jonas. > > > On 06/30/2010 11:36 AM, Gareth Blades wrote: >> Routers wont cause echo. In order for them to do so they would have to >> store the outbound voice traffic, delay it and then mix it into the >> inbound voice. >> >> Telephones inherently cause echo. For domestic calls the audio path is >> normally so short that any echo arrives back so quick the human ear does >> not detect it. For international calls the telco uses expensive echo >> cancelation technology. >> When you switch to voip you are often suddenly introducing a much larger >> delay so any excho which was present before but not noticed suddenly >> becomes noticable. >> >> You need to analyse the audio path your calls are taking, where the >> delays are being introduced and where echo cancelation is being applied. >> >> You also havent stated which end of the conversation is hearing the echo.