YesTalkTM IP PBX--------------------------------------------------------------------------------------------------------------------------------
YesTalkTM IP PBX is developed based on Asterisk which is a complete PBX in software. It runs on Linux and provides all of the features you would expect from a PBX and more. Please visit http://www.asterisk.org for more details of Asterisk
Asterisk based YesTalkTM IP PBX offer a rich and flexible feature set such as the following:
System Capabilities
　·Voicemail System
　·Auto Attendant
　·Multi-tenant solutions
　·Interactive Voice Response
　·Overhead paging
　·Conversation recording
　·Flexible extension configuration
　　Multiple line extensions
　　Direct Inward Dial
　·Conference Bridging
　·Call Queueing
　·ADSI Menu System
　·Call Detail Records
　·Local Call Agents
　·Predictive dialling hooks
　·Remote Call Agents
　·Protocol Bridging (interoperability of VoIP/PSTN/Analog phones)
　·Scriptable & Extensible
Call Features: 　·Music On Hold
　·Music On Transfer
　·Call Waiting
　·Caller ID
　·Caller ID Blocking
　··Caller ID on Call Waiting
　·Call Forward on Busy
　·Call Forward on No Answer
　·Call Transfer
　·Call Parking
　·Call Retrieval
　·Remote Call Pickup
　·Do Not Disturb
Scalability 　·TDMoE (TDM over Ethernet) Interconnect PBX via Ethernet switches
　·AIX/TCP/IP Interconnect geographically separated switches and users
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Technologies
　·Inter-Asterisk Exchange (AIX)
　·H.323
　·Session Initiation Protocol (SIP)
　·Media Gateway Control Protocol (MGCP)
　·Analog PSTN Connectivity
　·Robbed Bit Signalling T1 Lines (RBS)
　·PRI Protocols for T1 Lines
　·IP Softphones: SIP, H.323, MGCP, GSM
　·Deskphones: ADSI, IP, SIP, H.323, XML
Codec Support 　·GSM
　·G.729
　·G.723.1 (pass through only)
　·Linear
　·G.711 Mu-Law
　·G.711 A-Law
　·ADPCM
　·ILBC
　·LPC-10
　·MP3 (decode only)

For more information please visit : http://www.er21.com for product or find more service http://www.yestalk.net which the solution can assist you.

alex@er21.com