I have no issues with asterisk and now I have one more difficult.
- One way audio is for outgoing and incoming calls. External calls.
- missing stream is always outgoing from my internal phones
- I use trunk
- I checked IVR calling by GSM and I was able to hear it
- I checked conference bridge - one caller internal one external and then everthing was OK, both directions stream were hearable
- used codecs in tests g711ulaw and g711alaw
- til now I only tested on phone cisco 7911 sip load