You are the network technician at Certkiller . Certkiller has several IP Phones that use the following configuration.
Tftp-server flash P00303020214.bin.
Telephony service.
Load 7960 – 7940 P00303020214-bin.
Max-ephones 48
Max-dn 288.
Ip source address 192.168.1.1 port 2000.
Create enf-files.
The IP phones fail to download firmware.
What is the cause of this problem?