Modem without Router

[brub]

Looking for a Modem with speeds at least to 400 + 600 prefered. No built in Router and be VoiP is there one out there

 

[USAFRet]

Looking for a Modem with speeds at least to 400 + 600 prefered. No built in Router and be VoiP is there one out there

Any suggestions would require more info.

Why modem only?
What type and speed connection is this?