FS-3724 2 ways to fix after updating to this version, 1) run set_zombie_exec in the dp; 2) use system_on_fax_success/system_on_fax_failure vars with explicit name of your command

add send_info dp app and uuid_send_info FSAPI and execute_on_sip_extra_headers and api_on_sip_extra_headers handler variables

comment out optional Require header from re-invites for the sake of interop with testy t.38 terminals

FS-3714 --resolve You are using the sip_from_host and sip_to_host which are calculated based on the response from the other end, this patch will pre-populate the variables with what it is suspeceted to be in these values but they are not guranteed to be right if there was forwarding etc and also it will not always be an ip if you send to foo@domain.com the sip_to_host will be domain.com until it replies.  This is the best you will get....