MikroTik

# Declare the iPXE option space
option space ipxe;
option ipxe-encap-opts code 175 = encapsulate ipxe;

# iPXE feature flags, set in DHCP request packet
option ipxe.http      code 19 = unsigned integer 8;
option ipxe.bzimage   code 24 = unsigned integer 8;
option ipxe.pxe       code 33 = unsigned integer 8;
option ipxe.elf       code 34 = unsigned integer 8;
option ipxe.efi       code 36 = unsigned integer 8;
option ipxe.menu      code 39 = unsigned integer 8;

# Other useful general options
option arch code 93 = unsigned integer 16;

class "PXEClient" {
        match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
        
        allow booting;
        allow bootp;

        next-server 10.0.0.1;

        # Make sure the iPXE we're loading supports what we need,
        # if not load a full-featured version.
        if exists ipxe.http
          and exists ipxe.menu
          and ((exists ipxe.pxe
              and exists ipxe.bzimage
              and exists ipxe.elf)
            or (exists ipxe.efi)) {
                # Everything is fine, just send the boot configuration file.
                filename "http://10.0.0.1:3928/default.ipxe";
        } elsif exists user-class and option user-class = "iPXE" {
                # We're already using iPXE, but not a feature-full version,
                # and possibly an out-of-date version from ROM, so load a more
                # complete version with native drivers.
                if option arch = 00:06 {
                        filename "/ipxe/efi-i386.efi";
                } elsif option arch = 00:07 {
                        filename "/ipxe/efi-x86_64.efi";
                } else {
                        filename "/ipxe/ipxe.pxe";
                }
        } elsif exists user-class and option user-class = "gPXE" {
                # If someone has an old version of gPXE burned into their ROM,
                # load a more recent iPXE
                filename "/ipxe/ipxe.pxe";
        } elsif option arch = 00:06 {
                filename "/ipxe/efi-i386.efi";
        } elsif option arch = 00:07 {
                filename "/ipxe/efi-x86_64.efi";
        } else {
                filename "/ipxe/ipxe.pxe";
        }
}

# Siemens Opti Stage IP Phones
class "OptiIpPhone" {
        match if option vendor-class-identifier = "OptiIpPhone";
        option vendor-encapsulated-options 01:07:53:69:65:6D:65:6E:73:02:...;
}
 
 # Lync Phone
class "CPE-OCPHONE" {
        match if option vendor-class-identifier = "CPE-OCPHONE";
        option vendor-encapsulated-options 01:0B:43:50:45:...;
}
class "MS-UC-Client" {
        match if option vendor-class-identifier = "MS-UC-Client";
        option vendor-encapsulated-options 01:0C:4d:53:2d:...;

What's new in 7.0beta4 (2019-Dec-06 13:21):

!) included all features and fixes from 6.46 version;
!) implemented completely new User Manager package;
*) dhcpv4-server - added "option-set" parameter for each "vendor-class-id";
*) dhcpv4-server - added "radius-password' parameter under "config" menu;
*) dhcpv6-client - allow reading passed options in script;
*) dhcpv6-relay - include client's Link-Layer address in option 79;
*) interface - improved support for Intel, Mellanox and other generic network cards;
*) ipsec - fixed action=none policies;
*) ipv6 - added "disable-ipv6" parameter;
*) lte - added support for Quectel EC25-E;
*) lte - added support for Sierra Wireless MC7304;
*) lte - improved system stability when resetting modem;
*) package - fixed USB and CD-ROM installs;
*) ssh - improved key exchange algorithm support;
*) system - fixed port duplication on each system reboot;