I got a problem in calls that orginated from external devices to the vcs expresway as format XXXX@vcserealip.
however there is no problem as kind of calls SIP URI format XXXX@domain.com
are there any advices?
From my understanding of your issue, @VCS_IP calls fail, while @domain calls work?
You can create a transform on your VCS to convert the VCS_IP to your domain. We have this same issue with our VCS on occasion, you can try the following, it should resolve your issue.
Pattern type: Suffix
Pattern string: %ip%
Pattern behavior: Replace
Replace string: <your domain without @>