Ejigbo,
Is there no way to change the lease time on this device to allow the IP to stay the same? Maybe there is a way to give the tenor a static IP?
If not, then you should connect the tenor either to another switch that can provide static IP or does not have the lease situation.
As for bandwidth there is really not too much else that can be done unless you get a switch that can do this for you.
MikeM
mike_voip@hotmail.com