Issues in Voice Calling on FTTH

Shivam15 · Jul 6, 2020

I recently activated Voice on my BSNL FTTH. But there is some issues, calls are coming on the landline from other Landlines & BSNL Mobile.. But not coming from Airtel to Landline.. Anybody knows the reason?

On the other hand, Calls are going from Landline to all mobiles, landlines etc.

And anyone has experience with Panasonic Cordless phones? It simply silents after one ring and makes it tough for anyone to notice a call. Is there anyway to make it ring for long time.

Thank you.

Bokya · Jul 7, 2020

In my case there is problem when calls are made from landline to other bsnl mobile numbers. Calls are getting picked up but no voice but bsnl mobile to landline works fine. No problem for other networks as of now. Never tried landline to other landline. We also use Panasonic cordless phone for this connection.

Shivam15 · Jul 7, 2020

^^ Okay.. So does your phone ring continuously when call comes? or silents after just one ring.. like my case. I need to make my Panasonic ring continuous like a mobile phone.

Also, telephone lines use RJ11 cable/connector and I need to increase the length.. Can I cut this wire from middle and attach an electric wire? Will it work as smoothly as rj 11 cable?

Bokya · Jul 7, 2020

yes occasionally it gets cranky like you described. Cant comment on your second query as I didnt try that myself but few years ago bsnl guy did that between bsnl copper wire and rj11 cable.

Rahul Kalani · Jul 7, 2020

FTTH landline is not at all reliable. In between I was having issue connecting to airtel numbers. It got solved automatically. Now every now and then the phone stops working and starts working when I restart the ONT.

Shivam15 · Jul 7, 2020

Bokya said:
yes occasionally it gets cranky like you described. Cant comment on your second query as I didnt try that myself but few years ago bsnl guy did that between bsnl copper wire and rj11 cable.

okay I have some extra rj11 cable.. will see if it works well with copper wire or not...

Bokya · Jul 7, 2020

yes it can be done. upper copper wire going to the landline on ground floor and lower wire is rj11 from Syrotech router in my room

pachabhut · Jul 7, 2020

Bokya said:
yes occasionally it gets cranky like you described. Cant comment on your second query as I didnt try that myself but few years ago bsnl guy did that between bsnl copper wire and rj11 cable.

In the 90's I had used single pair telephone wire to extend connections in our house. Never tried with normal electric wires.

Shivam15 · Jul 9, 2020

Bokya said:
yes it can be done. upper copper wire going to the landline on ground floor and lower wire is rj11 from Syrotech router in my room

So, I used a thin Aluminium wire to extend it by 10 mtrs and its working very nice.. Voice quality still great. 😉

Although still calls are not going through via Airtel on it.. 😡 While calling from Airtel, it says THIS NUMBER IS INVALID. PLEASE CHECK THE NUMBER YOU HAVE DIALED.

Bokya · Jul 10, 2020

good to hear that it worked for you. Still dont know how to solve landline to bsnl mobile calling issue as we use 3 bsnl mobiles in family.

Shivam15 · Jul 10, 2020

There is one more issue... When a call comes on it and its picked up... Both Internet & Call disconnect (red light glows on modem).

Is it because of low input power ?? My input power is Minus 33 ☹

Also, now Calls are going through my Airtel to Landline but still calls are not coming from other Airtel numbers in STD. i.e. Out of state airtel numbers.. BSNL is really weird. LOL

Thank you.

Gokul Kannan · Jul 10, 2020

Your RX power is low, most ONTs are designed to work well when RX power is between -27 dBM and -3 dBM.

varkey · Jul 10, 2020

Yep, it's well outside the manufacturer's specs, so the device can behave in unexpected ways.

Shivam15 · Jul 13, 2020

SO, I called nearby exchange and the guy said I need power less than -27 for phone to work.. I called LCO and got it rectified to - 26. Even then internet & call is getting disconnected when a call comes.

Then I called SDO, he said you need less than -15 for phone to work.. Is it something like that? Anyone has any idea how much power is necessary for phones to work on FTTH.

varkey · Jul 13, 2020

The ONT devices are designed to work with -27/-28 dBm input power level at the minimum, however it works even when the signal is lower than that but ofcourse it can get unpredictable as it's outside manufacturer specifications.

There is no real difference for internet and voice with respect to the optical power level. Your problem atleast now, is not the optical power level. Probably a bad ONT device perhaps. Or check your power adapter of the ONT, it can be faulty too.