I did some testing interop testing with mobile sip clients and freeswitch.
The clients tested were all tested on Android
With ice enabled call an extension on freeswitch that answers and plays music
linphone was the only client that had an issue
freeswitch is configured to bypass media
call from sipclient a to sipclient b through freeswitch
expected behaviour is both sides can send and recieve audio
show channels on freeswitch shows "channel bridge"
f-acrobits->linphone *linphone could hear
f-bria->linphone *linphone could hear
f-csipsimple->linphone *linphone could hear
f-linphone->acrobits *linphone could hear
For more detailed information on the test environment please don't hesitate to contact me and I will do my best to provide any information you require.