Houyuan Techology (HK) Limited ( houyuanhk.com ) produce voip pbx .
 

1.Open Source Asterisk
2.uClinux Operation System
3.Configurable IVR menu
4.Over 50-100 available SIP/IAX2 extensions for SMB use
5.20 concurrent calls
6.Voicemail to Email
7.Call Forward , Call Waiting, Call Transfer (Blind Transfer/ Attender Transfer)，Call Pickup/Call Parking ，Call Queues ，Ring Group ，Call Detail Record Call Routing
8.Conference Room
9.Password Protect for Conference Room
10.Follow Me
11.Music On Hold
12.Skype for SIP
13.SIP Trunk ，IAX2 Trunk ，PSTN Analog Trunk
14.Configure via WEB interface
15.Codec: G.711u/a, G.729, GSM, Speex, G.726
16.Full SSH access

Hardware

.CPU:  400MHz Blackfin 522 Chip
.Flash :256 MB
.SDPAM:64MB
.LED
.Programmable Reset Button

Module configuration

.Slots  for modules  :4
.Dual port XO :XO-02
.Dual port FS :FS -02

Interface
.2 X RJ45 port
.1 X Power port
.1 X UART interface
.1 X MMC/ SD slot
.8X RJ11 port (FS/XO interchangeable)

Electial

.Power input: DC 12V/3A