Prodys PortaNet User Manual page 103

Although G711 is detected automatically in ISDN mode, the Encoder is also
configured automatically because it is not possible to use it in any other
combination.
2. If we want to receive an algorithm that does not support automatic
synchronisation it is necessary to configure the Encoder to the same
algorithm.
3. If we want the Encoder to switch to the algorithm detected by the Decoder,
the Encoder should simply be set to AUTO mode.
PortaNet User Manual 103 of 156