From mitch, 7 Years ago, written in FreeSWITCH.
This paste is a reply to opus fail from mitch
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so with opus it seems FS tries to negotiate a rate that is not supported and drops the call, any easy way to stop this? 

2017-02-23 11:07:39.638528 [DEBUG] switch_core_media.c:2983 Changing Codec from opus@20ms@48000hz to opus@120ms@48000hz
2017-02-23 11:07:39.679057 [WARNING] switch_core_codec.c:721 Codec opus Exists but not at the desired implementation. 48000hz 120ms 1ch
2017-02-23 11:07:39.679057 [ERR] switch_core_media.c:3020 Can't load codec?codec?
2017-02-23 11:07:39.679057 [NOTICE] switch_core_media.c:3021 Hangup sofia/softphone/9998 [CS_EXCHANGE_MEDIA] [INCOMPATIBLE_DESTINATION]