Call Features: Authentication Automated Attendant Blacklists Blind Transfer Call Detail Records Call Forward on Busy Call Forward on No Answer Call Forward Variable Call Monitoring Call Parking Call Queuing Call Recording Call Retrieval Call Routing (DID & ANI) Call Snooping Call Transfer Call Waiting Caller ID Caller ID Blocking Caller ID on Call Waiting Computer-Telephony Integration AGI (Asterisk Gateway Interface) Graphical Call Manager Outbound Call Spooling Predictive Dialer TCP/IP Management Interface Traditional Telephony Interoperability E&M E&M Wink Feature Group D FXS FXO GR-303 Loopstart Groundstart Kewlstart MF and DTMF support Robbed-bit Signaling (RBS) Types PRI Protocols 4ESS BRI (ISDN4Linux) DMS100 EuroISDN Lucent 5E National ISDN2 NFAS Calling Cards Conference Bridging Database Store / Retrieve Database Integration Dial by Name Direct Inward System Access Distinctive Ring Do Not Disturb E911 ENUM Fax Transmit and Receive Interactive Voice Response (IVR) Local and Remote Call Agents Music On Hold Music On Transfer Flexible Mp3-based System Random or Linear Play Volume Control Predictive Dialer Privacy Overhead Paging Remote Call Pickup Remote Office Support Roaming Extensions Route by Caller ID SMS Messaging Supervised Transfer Talk Detection Text-to-Speech (via Festival) Three-way CallingTime and Date TrunkingVoIP Gateways Voicemail Visual Indicator for Message Waiting Stutter Dialtone for Message Waiting Voicemail to email Voicemail Groups Web Voicemail Interface Codecs ADPCM G.711 (A-Law & μ-Law) G.723.1 (pass through) G.726 G.729 GSM iLBC Linear LPC-10 Speex Protocols IAX™ (Inter-Asterisk Exchange) H.323 SIP (Session Initiation Protocol) MGCP (Media Gateway Control Protocol SCCP (Cisco® Skinny®)