Problems receiving calls via PSTN gradually getting worse
jmgVOIP:
I am based in the UK.
I have been using an OBI202 fitted with an OBiLine successfully for a few years. Recently I have been experiencing problems receiving calls on the PSTN line, getting gradually worse over the last couple of days and today I cannot receive any calls at all (I am using my cellphone to test). I have not changed anything at all. I have noticed the LED on the Line port sometimes flickers for 2-3 seconds when I make the call and then stops. However other times it does not even flicker. I have also monitored the line and noticed the voltage going to around -65 as I make the call with the cellphone but it is noisy, swinging to around -120 and sometimes goes positive to around +25v. Another observation is that sometimes it shows ringing on the status for 2-3 seconds then it turns on-hook and stays, probably in unison with the flickering of the Line described above.
I thought it might be the ObiLine or the OBI202 itself, so I swapped it for an OBI110 (my previous ATA!). Interestingly, it shows exactly the same behaviour - can make in/out calls via SP and out calls via PSTN but cannot recive calls via the PSTN line!!!
Could it be a problem with the phone line? Any ideas what to test next?
I appreciate any suggestion as I have run out of ideas!
drgeoff:
You don't appear to have done the obvious test!
Plug your phone directly into the PSTN line and call it from your mobile phone.
jmgVOIP:
Hello drgeoff, I forgot to say but yes I connected the phone directly and works fine. It is the OBI not able to detect the incoming call ringing. As I said, it sometimes works and sometimes shows "ringing" in the status page for 2-3 seconds and then return to on-hook. But most of the time now the OBI does not detect the incoming call - the status stays on-hook no matter how long I keep ringing.
gsmlnx:
Have you performed the quiet line test?
This involves plugging in a corded phone to the master socket on the main phone socket.
Look at the instructions here from a UK telecoms company, it is the same for all UK land line customers irrespective of supplier AFAIAA.
https://support.zen.co.uk/kb/Knowledgebase/Performing-a-Quiet-Line-Test
drgeoff:
Quote from: jmgVOIP on December 22, 2015, 02:27:08 am
Hello drgeoff, I forgot to say but yes I connected the phone directly and works fine. It is the OBI not able to detect the incoming call ringing. As I said, it sometimes works and sometimes shows "ringing" in the status page for 2-3 seconds and then return to on-hook. But most of the time now the OBI does not detect the incoming call - the status stays on-hook no matter how long I keep ringing.
That you experience the same with the 202 plus OBiline and the 110 suggests that neither of them is the culprit. Can you swap out the cables and any US to UK adsptors you are using?
One test that might give clues. If you have had the 110 for a few years it may be the hardware version that has a relay between the LINE and PHONE jacks. It joins the two when the 110 is unpowered. Connect up using the 110 but do not plug in the PSU. Lift the handset and if you hear dial tone you have the relay version. If so, call from your mobile. What happens.
Another test you can do is to connect the PHONE jack output of one OBi to the LINE input jack of the 110 or OBiLINE. The PHONE jack acts just like the PSTN line. You should be able to receive a SIP call to to the first device through a phone connected to the second one. (110 should be powered up.)
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