Hello All, I am a newbie to FreeSWITCH, please excuse if this question has already been answered. My requirement is as follows: * When an incoming call is received, it needs to be bridged to one of the 4 available destination lines * Minimal management of these lines is required: need to keep track of when each line was used, so that, when a new incoming call is received, I can use the oldest used available line to bridge the call to In order to achieve this, I have: * Defined a few global variables in vars.xml, which would keep track of each line's status (available/busy) and last used timestamp * Implemented a Lua script which 'chooses' the line based on global variables status and timestamp (using "global_getvar") and update the status of the line to be used (using "global_setvar") * Bridge to the line returned by the script * Execute another Lua script on hang-up, which updates the global variables I am now wondering if I would run into issues in cases where I receive concurrent calls (I am using a Sangoma E1 card, and will receive multiple concurrent calls soon)? Would I need to be applying some kind of explicit mutex protection in these scripts for the global variables? Thanks in advance! With regards, Sirish