I had a problem with my modem

Question

dear sir, my name is rabindra Shrestha from Kathmandu, nepal.i had a problem with my modem. when I plug in my landline phone it automatic hold the phone and after 15 sec . my phone desn't give any response. when i dial the number at the time of i plug the line then only it response but at the time of connection is give long beep tone and it gives out the msg remort server don't not responsed. in this case what must i have to do . plz give help me .my mailing address is [e-mail]