Since we have install IP pHone , we have problem with the RIS Serveur.

situation:

Two DHCP configured to lease IP to Machine and Phone, we have two building connected with routers, and we have somes Cisco switchs.

Bluiding 1: all serveurs (Dcs, exchange etc..), somes clients XP
builiding 2 : only client machines (XP)

building 1 and building 2 are connected with routers.

when i want to install a machine I have the following sequence:
the machine receive a configuration DHCP ( IP, gateway etc....) following by:

TFTP (1s)
MTFTP........ ( 3mn maybe more)

and

PXE-E32 : TFTP open timeout
TFTP.
PXE-T01: file not found
PXE-E3B:TFTP error file Not Found
PXE-M0F existing intel PXE ROM
operating system not found

I add these options ( 60 66 and 67 ) to dhcp

I think problem may come from switch or routetr
Please Help