I have compiled freeswitch from branch v1.6 sourcecode ,when i use speex codec , freeswitch console :
2016-05-09 15:37:31.611965 [WARNING] switch_core_codec.c:721 Codec SPEEX Exists but not at the desired implementation. 16000hz 64ms 1ch 2016-05-09 15:37:31.611965 [ERR] switch_core_media.c:3025 Can't load codec?
I think the key to the problem is here: "16000hz 64ms 1ch". If you look at the FreeSWITCH configuration file vars.xml, you will see many examples of ptimes like this one:
DVI4@16000h@40i - IMA ADPCM 16kHz using 40ms ptime. (multiples of 10)
So FreeSWITCH is probably complaining about that 64ms packet time, as it's not a multiple of 10. You should be able to change that in the codec preferences on your endpoint configuration.
