[. . . ] Features Secured, manageable, and feature rich IP-PBX Built-in PSTN trunks and IP trunks Built-in session border controller for NAT resolution MOH music-in port and Paging speaker-out port Easy installation and setup Star feature codes and personal web page IPX4000 IP-PBX are based on SIP protocol and designed for the small-to medium-size enterprise. [. . . ] It supports one WAN and one LAN Ethernet interfaces to be able to connect to the internet and the local network , as well as four FXO interfaces used to connect to the PSTN. It also includes the capability to convert RTP voice packets to PCM format , and vice versa. First , user may register SIP user agents (UA) , for example hard or soft phones , FAX or other SIP-compliant devices like conferences systems. Second , user may connect to the outside world via trunks. Maximum Capacity - 20 SIP Extensions - 20 Voice Mail Accounts - 10 Concurrent Calls - 4 PSTN Line Hardware - 1 RJ-45 Ethernet Ports - 4 RJ-11 FXO Ports - 1 Music-In Jack - 1 Page-Out Jack Supported Standards - SIP (RFC 3261-3265, 3325, 3515, 3581, 3842, 3891, 2976, 3326, 4235), SDP (RFC 2327) - RTP (RFC 1889, 2833), SRTP (RFC3711) - TLS (RFC2246), STUN (RFC 3489), TFTP (RFC1350), DNS (RFC 2782, 2915) - SNMP (RFC 1157), HTTP/HTTPS (RFC 2616, 2617) PBX Features - 3-Stage Hunt Group - Address Book for Speed Dial and Caller ID Name Resolution - Agent Group - Anonymous Call Blocking - Auto Attendant - Call Data Record (Email the Last Call Information) - Call Forward ¡V Always/Busy/No Answer Forward - Call Park - Call Pickup - Call Return - Caller-ID Blocking - Caller-ID Detection - Conference Room - Configurable RTP Port Range - DISA (Direct Inward System Access) - Do Not Disturb - DTMF - Internal Call - IVR Node TECOM CO. , LTD. - Multiple Language Support - Multiple Registration per Extension - Music on Hold (Input from . wav File or Music-In Jack) - NAT Traversal with Built-in Session Border Controller - Paging (to Phone or to Page-Out Speaker) - PSTN Trunk - Redial - Service Flag (Night Service) - SIP Registrar and SIP Proxy - SIP Trunk - SIP Trunk with Failover - Voice Mail with Message Waiting Indication (MWI) and Email Forwarding Administration - HTTP/HTTPS Web Based Configuration - Extension Status Display - Trunk Status Display - Current Active Call Status Display - Call Detail Record (CDR) - Adjustable Log Level - SIP Message Log - SNMP Supported Codecs - G. 711 u-Law and A-Law - G. 723. 1 - G. 726 - G. 729 A/B Broadband Router PSTN IPX4000 Phone V01070104 23 R&D Road 2, Science-Based Industrial Park Hsin-Chu, Taiwan, R. O. C. [. . . ] Tel : 886-3-5775141 Fax :886-3-5776854 web site: http://www. tecomproduct. com [. . . ]