hi all! can asterisk be used as a sip express router? or was there another software to use other than the asterisk pbx in setting up a ser?

you can use asterisk with SER, yes. check out the asterisk wiki for more info or google asterisk and SER. you’ll need to do some tweaking but it’s a good option.

is it harder to setup ser than setting up asterisk? are there also conf files so config for sip peers or users?