MicroNet Technology SP5101 - Manual (Page 59)

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5.4.5 Media Configuration
(1) Codec
- Codec Priority: set codecs priority in order. Please notice that
user can set from 1 to 5 codecs as their need. For example, user
can only set first priority as G.723.1, and set the others as x, that
means only G.723.1 is available.
- Packet Size: User can set different packet size for each codec.