Description: The Country Code in the NSF code is a single-byte field identifying the country where the group 3 fax equipment with non-standard capabilities were manufactured.

There are un ratified proposals on the table to extend this to a two-byte field. If the fax relay capability of the gateway is limited to the ITU T-series protocol, the value of the t38NSFCountryCode object is to be written into the Country Code field to preclude non-standard synchronization of the group 3 faxs terminals. Since a value of 0x00 refers to Japan, and a value of 0xFF is a Country Code extension mechanism, these cannot be used to disable non-standard synchronization.

The t38NSFCountryCode value used to override NSF-based synchronization is 0xAD (173). If the Country Code is extended to two bytes in the future, the second byte will be set to 0x00. In conjunction with this Country Code, a t38NSFVendorCode value of 0x0051 is used for NSF suppression. It is not possible to use a value of 0x0000 for this suppression since it refers to Compression Labs. To realize NSF suppression, all bytes in the Terminal Provider-Oriented Code field, which describes the manufacturer-specific capabilities, are set to zeros.