Hi Saki, "Voice-Sistem" is a VoIP "know-how" company based on a team with more than two years experience in SER installation/configuration and developing. Our offer contains initial installation of the system plus yearly technical support (that includes total care of our customer's deployment): 1. consulting and architecting your SIP network based on client requirements and capabilities of involved software. 2. initial installation which can include: - SER SIP server : - user authentication; - NAT traversal (using STUN or rtpproxy, depending of capabilities of used SIP User Agents); - setting up dialing plan; - interdomain routing based on prefixes; - PSTN interconnection based on access policies; - messaging interconnection with GSM network; - forward on busy/ not found / permanent - black and white lists - advance programmability of user's preferences via CPL (Call Processing Language); - accounting; - Web integration; - failure resilience (hot or cold backup servers); - SEMS (SIP Express Media Server) : - voicemail; - conference; - announcement service; - STUN server; - RTPProxy server; 3. yearly technical support - timely and qualified responses to your questions from our team; - code-base up-to-date and alerts on important changes and code-fixes; In case of mutual interest, we are looking forward to hearing of your detailed requirements (what services your configuration should provide). Our system can handle more than 10.000 concurrents(online) users and basically no limits for subscribed users (only database capacity limitation). Best regards, Marian Saki Yaka wrote: -- Voice Sistem http://www.voice-sistem.ro