[asterisk-users] 11.21.0 : echo woes : can't installcanceller (sean darcy)
Mc GRATH Ricardo
mcgrathr at mail2web.com
Mon Feb 1 12:49:13 CST 2016
Hi Sean
In case of electrical I think DAHDI card if could have the capability by a combinations of jumpers it will be too hard to set best level, think about it for one or a wide device, could take long time for start-up, and will require to adjust or controller periodically, therefore many terminal devices could have it inside, by changing jumpers or some components to adapt according to electrical line condition
By the other way market analogue terminals mainly follows, to FCC or European standards, I remember these kind of symptom happens with Panasonic KX-TS500, whatever PBX or line it feels echo.
In case of acoustic analogue device it used analogue circuit, SIP used DSP (Digital signal processing circuit) these last one is better than analogue system.
Mc GRATH Ricardo
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