Hello,

I apologize for my bad English.

Three years ago there was a message http://lists.freeswitch.org/pipermail/freeswitch-users/2015-June/113829.html and here I am faced with the same problem.
A stupid provider sends crypto in  RTP/AVP and to ensure processing this request, I inserted in the profile the parameter NDLB-allow-crypto-in-avp=true
But Freeswitch answers to INVITE inserting in OK this line: m=audio 0 RTP/AVP 19
and the provider understands this as "no audio" and does not send ACK and does not send rtp.

How to deal with this I do not know.

Regards.

Victor Bogatyryev