SIP Hosted PBX, Multi-Tenant, VoIP Platform for Service Providers - provides scalable and reliable SaaS IP Telephony Platform. Based on the Session Initiation Protocol (SIP), the products provide robust SIP Communication Platform for Service Providers and Enterprises PBX is an award-winning Business IP Phone System that provides robust, high performance, and intelligent IP-PBX (PABX) functionality. Supporting the industry standard--Session Initiation Protocol (SIP)-- PBX delivers a highly compatible product for migrating existing applications and services. PBX comes in two formats: Single-Tenant (Basic & Pro Ed.) for premises-based IP-PBX installation, and Multi-Tenant for Hosted PBX platform. The PBX is highly scalable and supports up to 2,000 users and more. PBX supports Microsoft Windows and Red Hat Linux. SIP SDK includes SIP activeX , SIP OCX , SIP DLL , SIP Lib and SIP Cab, so you can use the one you like the most. It is really easy to incorporate SIP controls in your web pages and/or applications. Sample source codes are available to download. SIP SDK can also be used to develop softphone for MS Windows Mobile based Pocket PC and Hand-Held devices. It delivers superior voice quality by integrating advanced digital voice processing features including acoustic echo cancellation, noise cancellation and adaptive jitter buffering. For more details, please visit the features link.