I'm not quite sure where to start as I'm a new to yate and yatebts... So I can make a call and keep the call up for an extend period without issues but I get no audio. Here is the errors that I'm getting once the call is answered. This also happens when calling 32843 David. SMS is working fine.
<WARN> DataTranslator::attachChain [0x7fa12c002730] 'mulaw' -> [0x7fa12c0133d0] 'gsm' failed
<WARN> DataTranslator::attachChain [0x7fa12c0131b0] 'gsm' -> [0x7fa12c011160] 'mulaw' failed
<WARN> DataTranslator::attachChain [0x7fa12c011df0] 'mulaw' -> [0x7fa12c017060] 'gsm' failed
<WARN> DataTranslator::attachChain [0x7fa12c016e40] 'gsm' -> [0x7fa12c011fd0] 'mulaw' failed