[Users] call management software

Hi all Is any one here in the group used any call management software for SER I have seen software for Asterisk hudlite, does any kind of software for SER any one tested and report their experiences why iam asking is after Ser running some days i get this error in my syslog sl_reply_error used: I'm terribly sorry, server error occured (2/SL) that time my users not able to make call, i keep get fast busy, that time i need to reboot the Ser so calls again start going out side If any kind of monitoring software available or do automated job, when ever found that calls are not going then restart SER or some kind of solution should help the admin to chek the logs, when the SER restarted. If not some one need to monitor constantly or wait for customer to call to support \the calls are not going then we restart service will back the services, but i feel bad practice, before customer realise some problem with server, the Admin able to fix the problem any suggestions will be appriciated. ram,