Problems receiving calls via PSTN gradually getting worse
jmgVOIP:
Thanks drgeoff/gsmlnx for your suggestions which I will be trying over the next couple of days. I will let you know of my findings when I conclude the tests.
jmgVOIP:
I could not carry out a quiet line test as I don't subscribe to BT. I have carried out the first test suggested by drgeoff. First of all it is an old OBI110 and yes it has a relay which can be heard when powered on/off. If I connect a phone and power off the OBI I can make calls in with my mobile reliably. As soon as a power on the OBI I get the symptons outlined previously i.e. sometimes the line LED flickers for a couple of seconds and then stays on, but most of the time the LED stays on as a rereatedly dial i with my mobile. It seems like the OBI has difficulties detecting the signal in the same way as when loading the master sockets with various extensions and going over the REN safety value some phones will ring and some will not, presumably depending on the sensitivity/REM value of the phone.
I will try the second test later as I need to understand what drgeoff means and tryig to show. I have not my head around the connection scheme suggested.
ianobi:
Quote
It seems like the OBI has difficulties detecting the signal in the same way as when loading the master sockets with various extensions and going over the REN safety value some phones will ring and some will not, presumably depending on the sensitivity/REM value of the phone.
That would seem to suggest that the incoming ringing voltage supplied by the PSTN line has changed - odd but not impossible. As a test you could try reducing these values:
Physical Interfaces > LINE Port > Ring Detection > RingThreshold
Physical Interfaces > LINE Port > Ring Detection > RingValidationTime
I would carry on using the OBi110 for testing, at least until you have an answer.
drgeoff:
Quote from: jmgVOIP on December 22, 2015, 05:19:51 am
.. I need to understand what drgeoff means and tryig to show. I have not my head around the connection scheme suggested.
The second test is to have a different source of ringing instead of your PSTN line. The PHONE jack of an OBi supplies DC voltage and ringing voltage to a phone in a very similar manner to how a PSTN line does it. So the idea is to use the the PHONE jack of one OBi (say the 202) to substitute the PSTN line. Connect a PHONE jack (the one you usually have the phone plugged in to) of the 202 to the LINE jack of the 110. Make a call to the number that terminates on a SIP service on the 202. That will send ringing voltage from the 202 to the 110. If the 110 and the phone plugged into the 110's PHONE jack detect that reliably, then we would focus on why the PSTN ringing voltage seems insufficient.
It is a quite possible that you have a line fault, external to your property or internal which produces a low resistance between the two legs when ringing voltage is applied by the exchange. (Dampness, vegetation, verdigris etc.) That could reduce the ringing voltage below the OBi's threshold but still be enough to ring your phone when connected directly to the line. Indeed it is probably worth reducing the values suggested by ianobi as a quick and easy experiment before doing anything else.
jmgVOIP:
Some progress, I think. I carried out the tests suggested by drgeoff and in both cases the OBIs behave as they should. It therefore seems very likely that the fault lies with the PSTN line as suggested by drgeoff and ianobi. Unfortunately changing the ringing parameters was unsuccessful. I am now left with the unenviable task to ask my phone/broadband provider (TalkTalk) to check the line. I know exactly what they are going to say; "we only give support for equipment that we have provided. The point is that the broadband works and the phone works if connected directly, so it is going to be fun trying to convince them.
In the meantime thanks a lot for the help to get me where I am considering that a posted the topic only a few hours ago. I'll let you know the outcome.
Enjoy the end of the year!
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