Buy the Yeastar S300 VoIP PBX in Pakistan. Supports 100 users out-of-the-box, extendable to 500 users; feature-rich VoIP, call routing, voicemail, conferencing & expansion modules. https://ar.com.pk/yeastar-products/yeastar-s300-voip-pbx-pakistan-for-300-expandable-to-500-users/