i recently got a VOIP phone (vonage) from the US, i am a BSNL broadband user but i am not using the BSNL modem which they give..i use a modem of XAVi technologies model name X8821r+ ...i setup the modem to enable PPP which is required for my VOIP...but sometimes i dont get net (i dont need to login as PPP is activated..i get connected as soon as i switch on)...is it a prob with my modem...and one more thing i cant use my landline when i am on net..the net gets disconnected..by using the BSNL modem can i simultaneously use both net and landline..should i change my modem..please help