The operator has set vlan as 1831 and all the sip server configuration is done. I changed the vlan to 1830 and checked whether voice is enabled or not. Changing vlan to 1830 didn't work for me. On telling this issue in BSNL CSC, they asked the operator to check whether they have enabled vlan or not. But still it's of no use. Enable vlan is selected in Syrotech router. I took the router to the operator's place and after connecting the OFC cable to my router in operator's office, FXS light was on but in my home, FXS light is not turning on after connecting. LCO told he'll try to get the issue fixed .. if it doesn't work, he told me not to expect voice services.Yes for new connections they are not providing static IP for voice , but you need to select DHCP and VLan ID as 1830 or 1831 . My status is up still it always displays registering . I have taken connection 4-5 months back, so i have lost now hopes of using voip. Also when i call my landline no. via cell , it says no. doesn't not exist. BSNL charged Rs250 (one time charge) for voip and confirmed its activated from their end. Only option left is to visit nearby exchange , but its not that urgent so i ignored it.