There is a Bridge Connection in WAN settings on my ONT as well (ZTE F660). But I lack in networking skills so I would like some expert here to guide whether it is actually possible to use it along with IPTV and Landline.
UPDATE: So I created a WAN connection in bridge mode and connected TP LINK router (ZTE's LAN4 port to TP Link's WAN Port) and inserted PPPoE username and password but it wasn't connecting. Upon contacting 1218, the guy claimed 'sir bridge mode mein nahi chale ga sirf PPPoE mode mein hi chale ga aapka router'.
I was wondering if any one with Nokia or Huawei ONTs had any luck with it? If the router provides the option to do it then it is supposed to work unless PTCL is blocking it from their end somehow.
UPDATE 2: Good news, I managed to make it work. Credits to @topman11111
for pointing this feature out in PTCL's ONT though. Here are the steps I followed:
1. Login to your PTCL Router which is a ZTE F660 in my case. You can see the default username and password at the back of the router.
2. Navigate to Network > WAN > WAN Connection.
3. In the Connection Name dropdown, there should be an entry called 'omci_ipv4_pppoe_1', click that and you will see all of its details below configured by PTCL.
4. Now check you VLAN ID and note it somewhere.
5. In Connection Name dropdown, click Create WAN Connection. After that, input any Connection Name you want, now here is the IMPORTANT STEP
, check the VLAN ID box and enter the ID you noted in STEP 4. Leave the 802.1p to default. Now for the Connection type, select BRIDGE CONNECTION. Click Create to save it.
6. Under the same Network tab, go to LAN > DHCP Port Binding. In this tab, change the LAN 4 to WAN. Click Submit. This is the port you will connect your other router to, so we have disabled DHCP for this port.
7. Go to DHCP Binding tab in WAN. Select the connection you created earlier in Step 5 and check the LAN4 option. I am not sure if it makes any difference but I did it anyways.
8. Go back to WAN Connection tab and select the 'omci_ipv4_pppoe_1' connection. Now you have to disable this connection by unchecking Enable VLAN option. After you save it, you will loose internet access as the router is in bridge mode now.
Note down the the Username mentioned here. Password should be 'ptcl' by default without the quotes.
9. Connect your other router like this:
PTCL Router LAN 4 -> Other router WAN Port
10. Turn the other router on, set it to router mode if it isn't by default. Now go to it's WAN settings and from their you have to select Connection type as PPPoE. Insert the username and password you noted earlier in Step 8 and click Connect.
Leave the IPTV and the Landline connected to your PTCL router and connect any other devices you want with your new router.
YOU HAVE TO REPEAT STEP 8 EVERYTIME YOUR PTCL ROUTER IS RESTARTED as the router resets to default PTCL's config. Mine is connected to the UPS so it almost never turns off.
THATS IT! Enjoy your OpenWRT Routers and all that cool stuff now.
NOTE AND DISCLAIMER:
If anything goes wrong and you can't get back the internet, just reboot the PTCL router, it should be back to its default config. I won't be responsible for any issues regarding your internet.