Selective/anonymous call rejection
Hot line and warm line calling
Speed dialing of eight numbers/addresses
Music on hold

Voice gateway
SIPv2: Session Initiation Protocol v2 (RFC 3261, 3262, 3263, 3264)
SIP Proxy Redundancy - Dynamic via DNS SRV, A Records
Re-registration with Primary SIP Proxy Server
SIP Support in Network Address Translation Networks - NAT (incl. STUN)
Secure (Encrypted) Calling via Pre-Standard Implementation of Secure RTP
Codec Name Assignment

Voice Algorithms
G. 711 (A-law and μ -law)
G. 726 (16/24/32/40 kbps)
G. 729 A
G. 723.1 (6.3 kbps, 5.3 kbps)
Dynamic Payload
Adjustable Audio frames per Packet

Fax Capability
Fax Tone Detection Pass-Through
Fax Pass-Though - Using G. 711
DTMF: In-band & Out-of-band (RFC 2833) (SIP Info)
Flexible Dial Plan Support with Interdigit Timers and IP Dialing
Call Progress Tone Generation
Jitter Buffer - Adaptive
frame Loss Concealment
Full Duplex Audio
Echo Cancellation (G. 165/G. 168)
VAD - Voice Activity Detection with Silence Suppression

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