Hi there i would like to contribute to TPLink Quick Setup as i seen you already have old ADSL settings for Hrvatski Telekom and some other ISPs and as i connected my VR400 and VR2100v to Croatian ISP Hrvatski Telekom aka T-Com and works perfect on both Fiber/FTTH and VDSL.

Here are settings for Hrvatski Telekom 

VDSL
Hrvatski Telekom

Internet PPPoE
VLAN ID 1203  Priority 0  MTU 1492

IPTV Bridge
VLAN ID 1500  Priority 2

VoIP IPoE (DHCP)
VLAN ID 1405 Priority 5
DNS1 ---> 10.24.13.4
DNS2 ---> 10.23.1.4

VoIP Settings

RegistrarServer ---> ims.t-com.hr
ProxyServer ---> ims.t-com.hr
OutboundProxy ---> ims.t-com.hr
ProxyPort ---> 5060
Protocol ---> UDP
DSCPMark ---> 40
RegisterExpires ---> 3600

Region Serbia 
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Fiber/FTTH

Hrvatski Telekom

Internet PPPoE
VLAN ID 100  Priority 0  MTU 1492

IPTV Bridge
VLAN ID 1500  Priority 2

VoIP IPoE (DHCP)
VLAN ID 101 Priority 5
DNS1 ---> 10.24.13.4
DNS2 ---> 10.23.1.4

VoIP Settings

RegistrarServer ---> ims.t-com.hr
ProxyServer ---> ims.t-com.hr
OutboundProxy ---> ims.t-com.hr
ProxyPort ---> 5060
Protocol ---> UDP
DSCPMark ---> 40
RegisterExpires ---> 3600

Region Serbia 

PPPoE and VoIP Usernames and Passwords are obtained by calling ISP support