FMTP is missing in retransmitted 200OK message from freeswitch

[anusha0611]

Hello,

I have a project where in I am using freeswitch for signalling. for some unknown reasons, ACK from the callee did not reach freeswitch, hence it retransmits the 200 ok message. In the retransmitted message , there is no fmtp in the a line header. Can you please suggest why freeswitch is stripping this off while retransmitting the 200ok message ?

[dragos-oancea]

your statements seem inaccurate. without a network trace in pcap format we can't say anything. About the ACK problem: it can even be a firewall issue or SIP ALG - you'll probably want to disable SIP ALG. About the fmtp problem we need trace and FS logs.