Section: 9.3.31.1 User-user
Content: Some networks may only support a maximum length of 35 octets. Procedures for interworking are not currently defined and are for further study. R98 and earlier versions of this protocol specified a minimum length of 3 octets for this information element (not counting the IEI). To avoid interworking problems with mobile stations supporting only R98 or earlier versions of the protocol, the network shall deliver the User information message to these mobile stations only if the length of the User-user IE is greater or equal to 3 octets (not counting the IEI).