8 7 6 5 4 3 2 1 1 -------- TMRPU ------- - Transmission medium requirement prime/used 0 0 0 0 0 0 0 0 - speech 0 0 0 0 0 0 0 1 - spare 0 0 0 0 0 0 1 0 - 64 kbit/s unrestricted 0 0 0 0 0 0 1 1 - 3.1 kHz audio 0 0 0 0 0 1 0 0 - reserved for alternate speech (service 2)/64 kbit/s unrestricted (service 1) 0 0 0 0 0 1 0 1 - reserved for alternate 64 kbit/s unrestricted (service 1)/speech (service 2) 0 0 0 0 0 1 1 0 - 64 kbit/s preferred 0 0 0 0 0 1 1 1 - 2 x 64 kbit/s unrestricted 0 0 0 0 1 0 0 0 - 384 kbit/s unrestricted 0 0 0 0 1 0 0 1 - 1536 kbit/s unrestricted 0 0 0 0 1 0 1 0 - 1920 kbit/s unrestricted spare The format of the transmission medium requirement prime parameter field corresponds to the format shown in Figure 54, except that the coding rules for optional parameter are applied. The following codes are used in the transmission medium requirement prime parameter field
0 0 0 0 0 0 0 0 speech 0 0 0 0 0 0 0 1 spare 0 0 0 0 0 0 1 0 reserved for 64 kbit/s unrestricted 0 0 0 0 0 0 1 1 3.1 kHz audio 0 0 0 0 0 1 0 0 reserved for alternate speech (service 2)/64 kbit/s unrestricted (service 1) 0 0 0 0 0 1 0 1 reserved for alternate 64 kbit/s unrestricted (service 1)/speech (service 2) 0 0 0 0 0 1 1 0 reserved for 64 kbit/s preferred 0 0 0 0 0 1 1 1 reserved for 2 × 64 kbit/s unrestricted 0 0 0 0 1 0 0 0 reserved for 384 kbit/s unrestricted 0 0 0 0 1 0 0 1 reserved for 1536 kbit/s unrestricted 0 0 0 0 1 0 1 0 reserved for 1920 kbit/s unrestricted spare reserved 0 0 0 1 0 0 1 1 spare reserved 0 0 1 0 0 1 0 1 spare reserved spare