![]() ![]() The IP phone initializes applies the IP configuration to the IP stack IP phone send DHCP Discover broadcast requesting an IP addressĭHCP server selects a free IP address from the pool and sends along with the other scope parameters as a DHCP Offer ■ Initialize the IP stack - The IP phone will then initialize a basic IP stack. ■ Discover the Voice VLAN - Learn which VLAN is the voice VLAN through the layer 2 Cisco Discovery Protocol (CDP). ■ Boot - The IP phone will then bootstrap ■ POST - The phone will perform some basic tests called a Power On Self Test (POST). ■ Receives power - The IP phone receives power When an IP phone first receives power, the following steps happen: On the Cisco CME router a DHCP Scope can be configured. Through CDP the IP phone learns what the auxiliary VLAN is For an explanation of codes 150 and 66 see the first chapter.The phone performs a Power on Self Test (POST) We will connect to Mikrotik and use the terminal or you can follow the command in GUI. So the final value for Mikrotik configuration is 0xC0A84196. We also need to add the 0x at the start, which will say to Mikrotik that the value is in hexadecimal format. Convert decimal values to hexadecimal and then put it all together. Ok for example let’s have the IP of TFPT server 192.168.65.150 Ok, now we have all the required knowledge lets go to config. The IP address should be in the hex format so we need to convert our IP to hex. Option 66 is an open standard juniper that supports it. Like option 150, option 66 is used to specify the Name of the TFTP server. The IEEE standard that matches this requirement is Option 66. The format of the option is:Ĭode Len IPv4 Configuration Server Address(es)ĭHCP Option 150 is Cisco proprietary. The part that we are interested in is the format of this option. The pushing TFTP server value with the DHCP server is described in RFC 5859. Here I will show you how to set this value in the Mikrotik DHCP server. The VoIP phone use the TFTP server to download configuration files. Sometimes you need to push the TFTP server value as part of the DHCP process, for example, this is used in most VoIP systems. ![]()
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