Testing without phisical or software phones

Is there any way to test asterisk/freepbx performance and functionality without Digital or software phones? Something like number of virtual phones with controling calls by “tail -f [logfile]|grep [smthng]” or another way?

For testing very complex queue I need to hold nearby many phones (now they are up to 10) and it’s uncomfortable for me.

sipsak or asterisk “call files” come to mind.