Linksys Spa3000

Salient Features of Linksys SPA3000 :-
Forward Calls to VoIP service - Selective, Authenticated, All
Forward Calls to PSTN service - Selective, Authenticated, All
PSTN Line Sharing with Multiple Extensions
Automatic PSTN Fallback (Loss of Power or IP Service to Unit - with Quiescence to Normal Operations)
Advanced Inbound and Outbound Call Routing
Single Stage and Two Stage Dialing
Independent Configurable Dial Plans - Up to 8
Force PSTN Disconnection
Sequential Dialing Support

VoIP to PSTN Authentication and Routing
VoIP to PSTN Gateway Enable/Disable
VoIP Caller Auth Method (None, PIN, HTTP Digest)
VoIP PIN Max Retry Setting
One Stage Dialing Enable/Disable
VoIP Caller ID Pattern Matching
VoIP Access Allowed Caller List (No Further Authentication)
VoIP Caller PIN and Associated Dial Plan

PSTN to VoIP Authentication and Features
PSTN to VoIP Gateway Enable/Disable
Caller Auth Method: None, PIN, Caller ID
Ring Through to FXS Enable/Disable
Ring Through Tone - Configurable
Caller ID (Bellcore 1) for VoIP Service Access
Caller ID Enable/Disable
PIN Max Retry Settings
Access Allowed Caller List (No Further Authentication)
Caller PIN and Associated Dial Plan
Least Cost Routing (via Outbound VoIP - Line1 Dial Plan)
International Control
FXO Port Impedance - Configurable to 16 settings
Ring Frequency - Configurable
SPA to PSTN and PSTN to SPA Gain Settings
Ring Frequency - Maximum Setting
Ring Validation Time Setting
Tip/Ring Voltage Adjustment Setting