opensipsdbctl: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/sbin/opensipsdbctl - from package: opensips

You may install the required package with command yum install {package}

Error in other languages:
opensipsdbctl: bevel nie gevind nie
opensipsdbctl: comandă negăsită
opensipsdbctl: comando não encontrado
opensipsdbctl: commande introuvable
opensipsdbctl: command not found
opensipsdbctl: käsku ei ole
opensipsdbctl: không tìm thấy lệnh
opensipsdbctl: komanda nerasta
opensipsdbctl: Kommando nicht gefunden.
opensipsdbctl: kommandot finns inte
opensipsdbctl: komut yok
opensipsdbctl: nie znaleziono polecenia
opensipsdbctl: níor aimsíodh an t-ordú
opensipsdbctl: no se encontró la orden
opensipsdbctl: no s'ha trobat l'ordre
opensipsdbctl: opdracht niet gevonden
opensipsdbctl: parancs nem található
opensipsdbctl: perintah tidak ditemukan
opensipsdbctl: príkaz nenájdený
opensipsdbctl: příkaz nenalezen
opensipsdbctl: команда не найдена
opensipsdbctl: командата не е открита
opensipsdbctl: 命令找不到
opensipsdbctl: コマンドが見つかりません