[Linphone-developers] linphone android -- no ack signals, srtp not mandatory

[ntbg]

Dear Friends,

I put a logging logic in kamailio/sbc but found no ack messages in TCP or TLS SIP connections, and outbound calls would be dropped within 30 seconds --unless the other leg is a tcp/tls connection.

And I specified srtp in network-media encryption. While android linphone receives a inbound call, the inbound connection is NOT SRTP , judging from the connection info in the pull-down dialogue details.

Are these two caused by the code ?

TY