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This paper describes the CELP coding module within the Adaptive Rate-Distortion Optimized sound codeR (ARDOR). The ARDOR codec combines coding techniques of different nature using a rate-distortion control mechanism, and is able to adapt to a large range of signal characteristics and system constraints. The implemented CELP codec is derived from the 3GPP AMR-WB codec. Adaptations were necessary to match the ARDOR structure constraints and several new features have been added to improve the codec performance in this context. Listening test results are given to illustrate the behavior of the final codec compared to state-of-the-art coders.