Prodys PortaNet Hardware And Reference Manual page 58

If NET = ISDN Bit Rate > 128 Kbps is not possible.
If the Bit Rate >256 Kbps, a 24 KHz sample rate is not possible.
If NET = ISND or X21 Bit Rate < 64kbps is not possible.
VI.4.8 AAC HE
The configuration steps are:
1. Bit rate.
6. Mode: MONO, JOINT STEREO, STEREO or DUAL.
7. Sample rate: 16 or 24 KHz.
8. CRC validation on/off.
9. Auxiliary data on/off.
If NET = ISDN Bit Rate > 128 Kbps is not possible.
If NET = ISND Bit Rate < 64kbps is not possible.
VI.4.9 aptX
The aptX menu allows the selection of Standard aptX or Enhanced aptX.
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NOTICE - AAC LD RESTRICTIONS
NOTICE - AAC HE RESTRICTIONS
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