Obi202 Echo Help Please
Shale:
TPIR,
Are you testing to and from a remote phone or a phone in the same room? I thought I had echo. I was playing extensively with strings to change the impedence. Boing! If I muted my cell phone, which was in my other hand from the wire phone, the echo went away.
Is the echo heard by you or the remote person or both?
Do you have a very long wire between your phone and the phone port on the OBI?
CoalMinerRetired:
Quote from: tpir72 on February 17, 2013, 04:45:29 pm
Is it right to assume that there isn't a way to tweak this in expert mode of OBI202? - And: Echo in telephony systems is caused by two main phenomena: the first is acoustic echo due to microphone pickup of audio. The second is electrical echo due to mismatched impedance.
In reply to this question only, I noticed there is a field for impedance for each of the two ports under Physical Interfaces. Yes, if you use the ObiTalk portal you need to get into Expert Mode to access the fields.
A few points. If you have the manual or otherwise can lookup the electrical specs for your analog phone handset, check what it shows for impedance. I've never seen anyone on here mention this Obi setting, ever. But it's not that complicated, the worst case you try a different value in the Obi, and you have to go back to the default setting. Since you cannot directly measure impedance, a little bit of trail and error may be called for. Note that as soon as you add a second analog phone to the port, you may be changing the impedance.
tpir72:
OK, progress report. I moved my wireless base station (cordless phone) a lot farther away. Same damn echo.
All the wife can say is she hates this and wants to go back to an analog phone.
I can tell everyone here that the echo is heard on both ends of the conversation .
I'll try playing with impedance next...
Thanks for the help.
Terry
Quote from: Shale on February 18, 2013, 03:43:09 pm
TPIR,
Are you testing to and from a remote phone or a phone in the same room? I thought I had echo. I was playing extensively with strings to change the impedence. Boing! If I muted my cell phone, which was in my other hand from the wire phone, the echo went away.
Is the echo heard by you or the remote person or both?
Do you have a very long wire between your phone and the phone port on the OBI?
tpir72:
Thanks, I'll try experimenting and see what happens. I did find this on impedance too. Looks like 600 ohms is standard:
http://en.wikipedia.org/wiki/Nominal_impedance
Quote from: CoalMinerRetired on February 18, 2013, 08:11:42 pm
Quote from: tpir72 on February 17, 2013, 04:45:29 pm
Is it right to assume that there isn't a way to tweak this in expert mode of OBI202? - And: Echo in telephony systems is caused by two main phenomena: the first is acoustic echo due to microphone pickup of audio. The second is electrical echo due to mismatched impedance.
In reply to this question only, I noticed there is a field for impedance for each of the two ports under Physical Interfaces. Yes, if you use the ObiTalk portal you need to get into Expert Mode to access the fields.
A few points. If you have the manual or otherwise can lookup the electrical specs for your analog phone handset, check what it shows for impedance. I've never seen anyone on here mention this Obi setting, ever. But it's not that complicated, the worst case you try a different value in the Obi, and you have to go back to the default setting. Since you cannot directly measure impedance, a little bit of trail and error may be called for. Note that as soon as you add a second analog phone to the port, you may be changing the impedance.
puzzeld:
Hi Terry,
There are couple more things you can try to resolve your problem.
1. Separate your data and voip traffic into two different vlan/subnets.
Example:
Data = vlan1/192.168.1.1
Voip = vlan3/192.168.3.1
2. Qos:
Setup your Quality of Service for Voip to the highest priority and leave everything else the same.
I don’t know if can do the above on your router but you can set it up on your Obi202 for sure. Since I don’t own Obi202, I cannot walk you through the setup. If you are having trouble setting it up then may I suggest that you either grab a manual and learn or ask someone here for help.
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