Product specifications

Data Sheet
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 5 of 8
Provisioning, administration, and
maintenance
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TR-069
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Automated provisioning and upgrade via Cisco XML profile, HTTP, HTTPS
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Asynchronous notification of upgrade availability via NOTIFY
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Web browser administration and configuration via integral web server
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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
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Per-line and purpose configurable syslog and debug options
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Simple Network Management Protocol (SNMP) version 2
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RADIUS support with external server
High-availability features Automatic failover and recovery of WAN connection enabled with USB mobile broadband modem
Table 3. Voice Features of the Cisco SRP 500 Series
Feature Description
Voice gateway
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SIP version 2 (RFC 3216)
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Sending SIP messages via UDP/TCP
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Echo cancellation (G.167 and G.168)
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Dynamic jitter buffer
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Simple traversal of UDP through NAT Serial Tunnel (STUN) (RFC 3489)
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SDP (RFC 2327)
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RTP/ RTCP over UDP
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3-way conferencing
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Remote firmware upgrade
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Dual-tone multifrequency (DTMF) tone detection and generation
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Voice activity detection (VAD)
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Silence suppression
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Comfort noise generation (CNG)
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Caller ID generation and detection (frequency shift keying [FSK] and DTMF)
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Media loopback
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SIP Transport Layer Security (TLS)
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SIP channels support both UDP and TCP transport
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Support for 2 simultaneous T.38 or G.729 calls
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T.38 fax relay, including V.17, V.21, V.27ter, and V.29 and fax pass-through (pulse code modulation [PCM])
(T.38 support is dependent on fax machine and network/transport resilience)
International
Telecommunications Union (ITU)
standard voice codecs
Voice algorithms
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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 AB
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G.723.1 (6.3 kbps, 5.3 kbps)
Telephony interface
signaling support
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Ring voltage: 40 to 90 Vpk
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Ring frequency: 20 to 25 Hz
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Ring waveform: trapezoidal with 1.2 to 1.6 crest factor
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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): -46 to -56V
Off-hook current: 18 to 20 mA
Terminating impedance: 600 ohm resistive
270 ohm + 750 ohm//150 nF complex impedance
Frequency response: 300 to 3400 Hz