Hello guys its me again my vpn issue was solved and i am facing another issue, I have an IP DTerm registration issue. I am using only web interface to program as I do not have PCPro. My system is NEC SV8100 with IP DTerm phone DT700 series. The issue is every extension I used it says Duplicate Register port. Below is the complete setting on what I did. I saw some video using PCPRO but i don't have one.

11-02 :Extension Numbering
I select the existing extension that are not being used. In my
case i select 831

10-46 :DT700 Server information setup
01: Plug and Play

15-05: IP Phone basic setup
I select the free extension 831 from dropdown list

02: I enter the MAC Address of my IP DTerm phone
27: put the personal ID index = 2 (correspond to 84-22)

84-22: DT700 Logon information
ID Index UserID Pass
001 830 830-----> already registered via vpn
002 831 831----->I select

Then I manually put into the DT700 phone the user Settings
USerID: 831
Pass: 831
Extension: 831

Then I got this message
"Duplicate Register Port >>> EXT-831"