Outgoing calls using trunk mentions 'All circuits are busy now'

With chan_pjsip, outbound proxies are treated as though they had come directly from a Record-Route header, and, in many cases, they need \;lr appending, to indicate that the request URI is the final one, not the proxy. Often they also need \;hide appending, to suppress the Route header that would normally happen. The backslashes are because ; is special to Asterisk, and are not part of the SIP protocol.