Identifying IP phones through OUI addresses
A device determines whether a received packet is a voice packet based on its source MAC address. A packet whose source MAC address complies with any of the Organizationally Unique Identifier (OUI) addresses of the voice devices is regarded as voice traffic.
You can use system default OUI addresses (see Table 11) or configure OUI addresses for the device. You can manually remove or add the system default OUI addresses.
The switch supports 128 OUI addresses, including system default OUI addresses.
Table 11: Default OUI addresses
Number | OUI address | Vendor | ||
|---|---|---|---|---|
1 | 0001-E300-0000 | Siemens phone | ||
2 | 0003-6B00-0000 | Cisco phone | ||
3 | 0004-0D00-0000 | Avaya phone | ||
4 | 00D0-1E00-0000 | Pingtel phone | ||
5 | 0060-B900-0000 | Philips/NEC phone | ||
6 | 00E0-7500-0000 | Polycom phone | ||
7 | 00E0-BB00-0000 | 3Com phone | ||
Typically, an OUI address refers to the first 24 bits of a MAC address (in binary notation) and is a globally unique identifier that IEEE assigns to a vendor. However, OUI addresses in this chapter are addresses that the system uses to determine whether a received packet is a voice packet. They are the logical AND results of the mac-address and oui-mask arguments in the voice-vlan mac-address command.