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Prestige 2602HW Series User’s Guide
Chapter 1 Getting To Know Your Prestige 43
• SDP (RFC 2327)
• RTP (RFC 1889)
• RTCP (RFC 1890)
Multiple SIP Accounts
The Prestige allows you to simultaneously use multiple voice (SIP) accounts and assign them
to one or both telephone ports.
Multiple Voice Channels
The Prestige can simultaneously handle multiple voice channels (telephone calls).
Additionally you can answer an incoming phone call on a VoIP account, even while someone
else is using the account for a phone call.
Voice Coding
The Prestige can use the following voice codecs (coder/decoders).
•G.711
•G.729
Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not transmitting
“silent packets” when you are not speaking.
Comfort Noise Generation
When the Prestige uses VAD, it generates and sends comfort (background) noise when you are
not speaking.
Echo Cancellation
The Prestige supports G.168, an ITU-T standard for eliminating the echo caused by the sound
of your voice reverberating in the telephone receiver while you talk.
QoS (Quality of Service)
Quality of Service (QoS) mechanisms help to provide better service on a per-flow basis. The
Prestige supports Type of Service (ToS) and Differentiated Services (DiffServ). This allows
the Prestige to tag voice frames so they can be prioritized over the network.
SIP ALG
The Prestige 2602HW is a SIP Application Layer Gateway (ALG). It allows VoIP calls to pass
through NAT.
Auto-provisioning
Auto-provisioning automatically updates your Prestige’s configurable settings via a TFTP
server.