What is this used forwell first we must understand the Boot process of an IP Phoneso here we go 1 st IP Phone is connected to an Ethernet switchport 8023af or PoE preferred 2 nd The IP Phone powers on and the VOICE VLAN information is delivered to the IP Phone via Ciscos CDP Cisco Discovery Protocol.

Ip phone boot up process. Phone Sends DHCP Request. The Cisco IP Phone connects to an Ethernet switchport. The switch continuously sends a small voltage on the transmit pins.

This another basic topic for Collaboration Engineers who are at the earlier stage of their Cisco Collaboration Journey. 1- The PoE switch using standard 8023af or Cisco inline power mechanism will detect that there is an unpowered IP device PD connected to its port and go ahead and provide power to the IP phone. The only information that is critical to an IP phone for the boot process is.

If the HTTP servers IP address is not set in DHCP option 242 it may be manually configured on the phone. Set the LAN speed and begin talking to DHCP in order to acquire IP addresses for the phone and and HTTP configuration server. DHCP Server Sends DHCP Response.

The Cisco IP Phone connects to an Ethernet switchport. The Phone use TFTP to download their config files firmware and other data. Without TFTP the phones simply do not function properly.

The Cisco IP Phone has a standard startup process consisting of several steps. Here is the Cisco IP Phone boot process start to finish. IP phone booting is a process that automatically registers your phone with a VoIP service.

Phone Sends TFTP Request for a Configuration File. But in a nutshell unless you are statically assigning the phone and telling it what to do you need a dhcp server with a SSON that tells the phone what vlan to goto what file server to get its config file firmware from where to register to that is a very very small nutshell But that is laymans terms read the document and also these. Hello KSB You have to be a little bit more specific in what information you are after.