Region : Poland

Model : TD-VG3631

Hardware Version : V1

Firmware Version : 0.6.0 1.0 v0001.0 Build 130108 Rel.54595n

ISP : NETIA

Hello

I have a problem with voip configuration.
Problem appears when somebody try to call my number.
I can make a call and voip status on my Router is UP.
Voip provider gave me this settings:

NAT Keep Alive Enable: Yes
Register Expires: 3600 [sec]
Proxy: sip.ipfon.pl or 213.218.117.66
User ID: SIP account login (ex. ipfon003)
Password: my SIP password
Preferred Codec: G711a (alaw/PCMA)

I've found all settings but one:
NAT Keep Alive Enable. What is the name of this options on VG3631?

Thanks in advance!