5.3.3. Vendor-Id AVP
The Vendor-Id AVP (AVP Code 266) is of type Unsigned32 and contains the IANA "SMI Network Management Private Enterprise Codes" [ENTERPRISE] value assigned to the Diameter Software vendor. It is envisioned that the combination of the Vendor-Id, Product-Name (Section 5.3.7), and Firmware-Revision (Section 5.3.4) AVPs may provide useful debugging information.
A Vendor-Id value of zero in the CER or CEA message is reserved and indicates that this field is ignored.