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Codecs must be added in the IP Bearer Profile in Dialogic Gate Control Element Management System (GCEMS) Clientview (IMG 1004 or IMG 1010) or the WebUI (IMG 2020) as described in the links below in the IMG documentation.
IMG 1010: IMG 1010 - Vocoder Entry
IMG 2020: Vocoder Profile
Product List
Dialogic IMG 1004 Integrated Media Gateway
Dialogic IMG 1010 Integrated Media Gateway
Dialogic IMG 2020 Integrated Media Gateway (IMG 2020), formerly referred to as Dialogic BorderNet™ 2020 Session Border Controller