Hi Seyuripa, you can login to Thomson gateway page and on Home page, click Telephony.
There is Configure link on the top right. Click that and you can see Telephony service configured.
Make sure the following:
1. Enabled Telephony is checked.
2. User name uri should be your maxis voip number (Eg: 03xxxxxxxx).
Port should be ALL.
Status column and Registered column should be Green (V).
If the Registered column shown as Red, goto Edit and specify the password.
The password should be maxis voip number + 1 (Eg: 03233018881). Click Apply.
It should now show as Green on the Registered column and the Maxis Thomson device light on Phone 1 and Phone 2
slot would be Solid Green. Please check that. If everything ok, test outgoing and incoming call.
If the Status column shown as Red, call up the Maxis FTTH support: 1800-82-4663.
The Customer service would be able to help you.
Hope this helps!