At the web interface access textttIPBrick .GT -> SMS
Click on Modify, and then choosing Yes will enable the service configuration. At Mail2SMS definitions we should define the specific domain to use for SMS sending. Normally it's used this FQDN: sms.domain.com, replacing the domain.com with the actual IPBrick's domain (Figure 4.31).
In IPBrick .GT -> SMS -> SMS Users, you can control the user's access to the Mail2SMS service.
Click on Modify, A list with all IPBrick users will appear (Figure 4.32). You can now check which ones you wish to grant access to this feature.