Where can I find a guide for setup an Asterisk server which can eastanblish a simple video call from two sip clients?
I don’t think there is a specific guide for this. In /etc/asterisk/sip.conf, you will find the the default setting is
_not_ to have video enbled. So either you enable it gloabally (for all sip-users) or individually for specific sip-users.
Greatest pit-fall. you have to analyse the codecs for all hard-phones and/or softphones. You should have atleast one common codec enabled. If not, you will only get an audio connection (unfortunately, without any warning)
Most safe option (atleast to begin with) is to use same clients at both sides, and configure them identically.
Second suggestion, is to define a echo-function. If you dial the defined extension, you get not only audio echo, but also video-echo.
I’ve been testing with a couple of clients, with various results.