echo on phones

[roi]

Hello. I'm having issues regarding very bad echo on internal calls(sip to sip) when both of them are using speakerphones, when both are using handsets everything is ok, and if one is using handset and the other line is on speakerphone it is ok as well. I've tried changing all the settings on the voipphone, but still no luck. Is it the ipphone settings that is causing the echo?

I'm using the latest release of elastix.
Here is the settings of my ipphone.
Thank you. http://forum.elastix.org/old_files/ipphone_settings.rar

 

[DaveD]

What brand phones are they ?

 

[mbit1]

Try turning down the volume on the speaker. Does it still echo?

 

[roi]

Hello guys!

We are using SOYO Phones and SVP305 SIP/IAX IP phones, even if we lower down the volume the echo is still there.