If you use freepbx, install fop2admin, then go to fop2 buttons and fill the "group" field. Any extension with the same group field will be shown in its own content box.
Best regards,
I do not know if lagged events are logged into the full log. I am reading AMI events, specifically sip qualify events. Doing a "sip show peers" in the asterisk cli will show lagged peers.
Best regards,