Hi. I'm using FreeSwitch 1.10.7 as a client registering to other PBXs as well as a SIP server itself. I am setting the user-agent string in the SIP profile, such as: <param name="user-agent-string" value="FS $${CFGver} $${hostname}"/> The variable $${CFGver}} is a version string I'm definiing in vars.xml This is working, but it gives me the FQDN of the machine as $${hostname}} and I really only want the machine name without the domain. I've found https://freeswitch.org/confluence/display/FREESWITCH/Regular+Expression and https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools:+regex and I've tried to use them to cut the domain off the value of $${hostname} but with no success: In vars.xml: <X-PRE-PROCESS cmd="set" data="shorthostname=${regex($${hostname}|([^\.]*).*| %1)}"/> This results in the variable shorthostname being assigned the value: %{regex(abcd.efgh.tld|([^\.]*).*|%1)} where abcd.efgh.tld is the server's FQDN. Instead of doing that in vars.xml and creating the variable shorthostname, I tried putting the regex into the SIP profile: <param name="user-agent-string" value="FS $${CFGver} ${regex($${hostname}| ([^\.]*).*|%1)}"/> This ends up with precisely the same result. The ${regex(....)} function simply isn't being executed. Given that the machine's hostname is also available from the system command "hostname -s" I decided to try that instead: In vars.xml: <X-PRE-PROCESS cmd="set" data="shorthostname=${system(hostname -s)}"/> Or in the SIP profile definition: <param name="user-agent-string" value="FS $${CFGver} ${system(hostname -s)}"/> These both produce the output: FS 0.65 ${system(hostname -s)} In other words, the ${system(....)} command isn't working any more than ${regex(....)} did. What am I doing wrong please? How can I get the machine's short hostname into a user-agent string for registration to a server? Thanks, Antony. -- Perfection in design is achieved not when there is nothing left to add, but rather when there is nothing left to take away. - Antoine de Saint-Exupery Please reply to the list; please *don't* CC me.