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© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 3 of 5
Voice gateway
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Session Initiation Protocol (SIP) v2 (RFC 3261, 3262, 3263, 3264)
SIP proxy redundancy-dynamic via DNS SRV, A records
Reregistration with primary SIP proxy server
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SIP support in Network Address Translation (NAT) networks (including Serial Tunnel
[STUN])
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Highly secure (encrypted) calling via prestandard implementation of Secure RTP
Voice algorithms
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Codec name assignment
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G.711 (A-law and µ-law)
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G.726 (16/24/32/40 kbps)
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G.729 A
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G.723.1 (6.3 kbps, 5.3 kbps)
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Dynamic payload
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Adjustable audio frames per packet
Voice specifications
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Dual-tone multifrequency (DTMF): in-band and out-of-band (RFC 2833) (SIP info)
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Flexible dial plan support with interdigit timers and IP dialing
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Call progress tone generation
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Jitter buffer-adaptive
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Frame loss concealment
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Full duplex audio
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Echo cancellation (G.165/G.168)
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Voice activity detection (VAD) with silence suppression
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Attenuation/gain adjustments
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Flash hook timer
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Message waiting indicator (MWI) tones
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Visual message waiting indicator (VMWI) via frequency shift keying (FSK)
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Polarity control
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Hook flash event signaling
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Caller ID generation (name and number)-Bellcore, DTMF, European
Telecommunications Standards Institute (ETSI)
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Music on hold client
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Streaming audio server-up to 10 sessions
Fax capability
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Fax tone detection pass-through
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Fax: G.711 pass-through or real-time fax over IP via T.38 (T.38 support is dependent on
fax machine and network/transport resilience.)
Security
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Password-protected system reset to factory default
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Password-protected administrator and user access authority
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Provisioning/configuration/authentication:
HTTPS with factory-installed client certificate
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HTTP digest-encrypted authentication via MD5 (RFC 1321)
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Up to 256-bit Advanced Encryption Standard (AES) encryption
Provisioning, administration,
and maintenance
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Web browser administration and configuration via integral web server
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Telephone keypad configuration with interactive voice prompts
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Automated provisioning and upgrade via HTTPS, HTTP, Trivial File Transfer Protocol
(TFTP)
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Asynchronous notification of upgrade availability via NOTIFY
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Nonintrusive, in-service upgrades
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Report generation and event logging
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Stats in BYE message
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Syslog and debug server records-per-line configurable
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Per-line and purpose configurable syslog and debug options
Physical interfaces
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Two 100BASE-T RJ-45 Ethernet ports (IEEE 802.3)
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2 RJ-11 FXS phone ports-for analog circuit telephone device (tip/ring)
Subscriber line interface
circuit (SLIC)
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Ring waveform: trapezoidal and sinusoidal *
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Maximum ringer load: 3 ringer equivalence numbers (RENs)
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On-hook/off-hook characteristics:
On-hook voltage (tip/ring): -50V nominal
Off-hook current: 25 mA min
Terminating impedance: 8 configurable settings including North America 600 ohms,
European CTR21