UK PSTN Voice quality dreadful through OBI -0 Solved. Not OBI problem - cable
ckdash:
UPDATE: Solved. Turned out to be a cable problem.
I installed this last week, and my family have complained constantly about the dreaful voice quality. Unfortunately even though I ordered from a UK site (Amazon) the device comes configured out of the box for US settings. I have made what changes I believe to be necessary, but still the quality is awful:
- my own voice echoed back after a second
- periods of silence
- buzzing on the line
I am beginning to think I may have a fault device - no-one would accept the quality I am getting from this.
Here are the changes I have made:
Phone port:
Impedance: 320+(1050||230nF)
CallerID FSK(V.23)
Ringback tone: 400-18,450-18;20;(.4+.2,.4+2)
Line Port:
Ring delay 200 (get callerid fine)
Dialdigitontime 70
Dialdigitofftime 70
ACImpedance 320+(1050||230nF)
onhook speed 3ms(ETSI)
Can anyone make any suggestions? I have tried various different impedance settings and it doesn't make any difference.
ckdash:
I've just read my post and it sounds a little rude, and very grumpy!. So I think I should also point out that I think this has the potential to be a superb device, and there are lots of good things about it.
If anyone is abe to post up some UK settings, I'd happily correlate al the various things sent and work up into a guide.
If anyone wants any help, I have this set up to work with my Asterisk system, bringing my VOIP, and PSTN together into one system, and have all my voicemail handled by Asterisk for my work, mobile, and home usage.
Stewart:
This may be relevant to your problems: http://www.obitalk.com/forum/index.php?topic=367.msg1932#msg1932
Please state whether you have hum and whether you have echo in each of these three cases:
1. Phone port to/from VoIP
2. Phone port to/from Line port
3. Line port to/from VoIP
ckdash:
Quote from: Stewart on May 07, 2012, 07:18:21 am
This may be relevant to your problems: http://www.obitalk.com/forum/index.php?topic=367.msg1932#msg1932
Please state whether you have hum and whether you have echo in each of these three cases:
1. Phone port to/from VoIP
2. Phone port to/from Line port
3. Line port to/from VoIP
Thanks.
1) has neither hum nor echo.
2) is a problem for both hum and echo
3) is a problem for both hum and echo
I have my system set up to co-exist with an Asterisk setup, so I can either directly dial out using # to get to the line port and then dial number, or I can just dial the number and it will route from the phone port to the asterisk server, and then out to PSTN via the OBI.
So if I have understood you correctly, option 2) is covered by # then dial number, option 3) is effectively covered by dialing through asterisk.
I suppose I could try a variant which is phone port through asterisk and out through Sipgate?
To be honest whereas the hum is annoying, it is the silences and the echo back of my voice with a second delay that is really annoying. Usually the echo back only happens for a few hundred milliseconds before it stops itself. To try and demonstrate what I mean, the sentence:
"Hi this is me talking on the phone"
would sound like, for example:
"Hi this is me talking ..m.. on the phone"
where the ..m.. is supposed to represent the quickly suppressed echo back of "me"
Stewart:
Possibly, it's a wiring problem. I assume that you have an adapter cable with a British plug on one end and RJ11 on the other. Make sure that the RJ11 pins used by the OBi, pins 3 and 4, are connected to ring and tip of your BT line (not ring and earth, or ring and tip of another line). Confirm that a phone connected via that cable does not have hum.
Is this a normal analogue line? If not, please explain, e.g. VoIP from Orange Livebox, connection via ISDN adapter, etc. Is there any other equipment between the OBi and the Line, e.g. an alarm system?
The device could be defective. If you have electrical test gear, you might check that the currents (when off hook) in the tip and ring leads are equal. Or, that the sum of ring-earth and tip-earth voltage is approximately the same (about -48 V) in both on-hook and off-hook states.
Do you have another power adapter to try?
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