PSTN line gain
WelshPaul:
Try setting the -2 and -1 values both to 0
Regarding the line port Tx set it to 0
Test again.
JeremyW:
Quote from: WelshPaul on February 04, 2015, 01:11:36 pm
Try setting the -2 and -1 values both to 0
Regarding the line port Tx set it to 0
Test again.
Done that. I'll test on a few calls tomorrow and report back.
JeremyW:
Quote from: WelshPaul on February 04, 2015, 01:11:36 pm
Try setting the -2 and -1 values both to 0
Regarding the line port Tx set it to 0
Test again.
Nothing I've tried really seems to work. Tweaking the TX gain up on the Line port just resulted in echo and the latest tweak above didn't seem to have any effect. Any further thoughts on something I else I can try?
Thanks.
JeremyW:
Extensive testing this evening: All TX and RX settings at default, then tweaked the Line port TX up to 2 from the default (0). Volume of my voice to the caller was improved but at the beginning of the call there was a slight amount of echo, which settled down, and then a slight delay causing us to talk over each other slightly. Manageable but I'm wondering if any further tweaks are possible to iron out the wrinkles or if I just have to accept the imperfections.
EDIT: These are PSTN calls ONLY. SIP calls are fine (they are only outgoing, I have no incoming SIP).
drgeoff:
SIP will always have an advantage over PSTN/POTS regarding echo and consistency of levels.
When you use POTS the analogue audio signals to and from your handset are on a common pair of wires. In your OBi they are separated and amplified or attenuated according to the level settings that you have been tweaking. Then the two signals have to be again on a single pair of wires to travel to/from your telco's switch. There they are separated again for carriage over the digital trunk network.
Those separation and joinings are never perfect; there is always some leakage of one direction into the other. Some of the imperfection is caused by the non-ideal characteristics of the 2-wire/4-wire conversion circuits and some is due to the actual line impedance being different from the value assumed in the design of the 2-wire/4-wire converter. Those leakages manifest themselves as echo.
In the majority of cases the end result is not troublesome but there may well be some, possibly yours, where there are enough significant shortcomings that their combined effect is troublesome.
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