The flowroute website mentions that they set callerid on outbound calls based on the presence of (in order of preference):
“P-Asserted-Identity”, “Remote-Party-ID” or “From:”.
I’ve been trying to make outbound callerid work via flowroute to no avail. Does anyone have an extensions.conf / sip.conf snippet howto make this work? This is for Asterisk 1.4.44.