The Grandstream GXE502x is a SIP based IP PBX which offers an integrated solution for unified voice, data, fax and video communications for SMBs. It supports many features like a “SIP Server” that supports up to 100 extensions and more than 50 simultaneous calls, it can also act as a data router with dual 10/100 MBps LAN ports and integrated PoE (802.3af), 4 or 8-port FXO ports, 2 FXS ports, SIP trunking accounts, fax server that automatically converts incoming faxes into PDF files for email delivery or secure storage, unified messaging for voice mail (up to 120 hours), fax mail (up to 10,000 fax pages), and video mail (up to 4 hours), session border controller for automated NAT traversal, and up to 4 conference bridges that allows up to 20 concurrent participants.

The GXE502x also offers many advanced features including voicemail-to-email, fax-to-email, video-mail-to-email, print-to-fax, auto-attendant that allows virtually unlimited customizable interactive voice applications, call queues, hunt/ring groups, call transfer/forward/park/retrieve, personalized music-on-hold, paging & broadcasting, dial plan, dynamic DNS, SRTP, TLS, peer systems, Audio-In & Audio-Out port and a USB port. The GXE502x supports most of the popular voice/video codec including G.711 a/u-law, G.726, G.723.1, G.729A/B/E, iLBC, T.38 fax relay, carrier grade G.168 line echo canceller with 128-ms tail length, H.264 baseline, H.263/H.263+.Furthermore, the GXE502x has a call center support with support for skills-based routing and busy level features. The most important thing about the GXE502x is its price which is under $550.
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