I cant understand what is the problem. Ph is bad? how can u sure its bad? and plz make clear about last line...

At the same switch port another ip ph is working. but this prob is for only one ip ph.

Hi,

Are there similar model phones in this office that are working?

I would factory reset the phone to start with, make sure there are no underlying infrastructure problems with the cabling/connection to the switch as well. You could try a new firmware (as per the previous message).

Is there a PC connected to the phone. If so, does that have a network connection? Also, where is the phone stuck on boot up? If it's searching for an IP have you checked the DHCP scopes to make sure there are available addresses?

If this is urgent I would definately swap the phone.

If useful, please rate post....