VOS3000 2.1.9.07 new version upgrade guide covers SIP improvements, billing precision, security, ASR failover, Web API, IVR, and CentOS 7 for VoIP operators.
VOS3000 Lightweight Registration Interval: Proven SS_ENDPOINTTIMETOLIVE
Configure VOS3000 lightweight registration interval with SS_ENDPOINTTIMETOLIVE. 60-second check without full SIP re-REGISTER detects offline endpoints faster.