NEC SP5008A - Manual (Page 23)

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3.1.2 Payload Type Setting
RFC2833 payload type Specify the RFC2833 payload type (range is 96~128,
however 100, 102~105 is reserved by other payload
types).
T.38 FAX payload type Specify the FAX payload type (range is 96~128,
however 100, 102~105 is reserved by other payload
types)
T.38 Redundancy payload type Specify the Redundancy payload type (range is 96~128,
default value is 104. 100, 102, 103, 105 is reserved by
other payload types).
T.30 FAX by pass payload type Specify the FAX by pass payload type (range is 96~128,
default value is 102. 100, 103~105 is reserved by
other payload types).
Modem by pass payload type Specify the Modem by pass payload type (range is
96~128, default value is 103. 100, 102, 104, 105 is
reserved by other payload types).
Modem relay payload type Specify the Modem relay payload type (range is
96~128, default value is 105. 100, 102~104 is
reserved by other payload types).