Quote from: Waqas on October 13, 2016, 01:25:58 PM
Does that make sense at all ?
Yes and no.
Yes, I understand what you have written. No, it does not make technical sense. It should not be happening. Your OBi and your phone line can only support one call at a time so there is no way that your local equipment is generating the busy tone to the second caller. That can only be coming from Talktalk.
Some tests might shed some light.
1. Some OBi110s contain a relay which, when the OBi110 is not powered, connects the centre two contacts of the LINE port to the centre two pins of the PHONE port. If you hear a mechanical click from your 110 when you software reboot it you probably have such a 110. You can confirm it by unpowering the 110 and taking its attached phone off-hook. If you hear dial-tone it is coming from Talktalk through that relay.
If you do have such a 110 try unpowering it and repeating your two call test. Clearly that should work properly, just as when the phone is connected directly to the Talktalk line.
2. If you have a second analogue phone and a line doubler, use them to have both the (powered) 110 (with its phone) and the second phone in parallel on the Talktalk line. (Not the two phones on the PHONE jack of the 110.) Make the first call and answer on the phone plugged in to the 110, then take the second phone off-hook so that both phones are active. Then make the second call. What happens? Divert or busy tone?
3. Revert to just the powered Obi110 and its attached phone. If you have not already done so, change the default 600 ohm ACImpedance of the LINE port to the UK value 370 + (620||310nF) and repeat your two call test. That should not change things, but you never know.
A further thought is that as you are in the UK you are probably using adaptors or cables to connect the RJ45 sockets on the OBi to UK type socket on the Talktalk line. Check that those are correctly wired - the centre 2 wires of the RJ45 should go to 2 and 5 of the UK plug/socket.
And if still not getting anywhere, does your phone line master socket have a test jack where you can connect the OBi110 directly to the copper pair without going through any xDSL splitter?