Linksys pap2-NA voip phone adapter router
Two voice ports (RJ-11) for analog phones or Fax machines
Impedance Agnostics - 8 Configurable Settings
Call Waiting, Cancel Call Waiting, Call Waiting Caller ID
Caller ID with Name/Number (Multi-national Variants)
Caller ID Blocking
Call Forwarding: No answer, Busy, All
Do Not Disturb
Call Transfer
Three-way Conference Calling with Local Mixing
Message Waiting Indication - Visual and Tone Based
Call Return
Call Back on Busy
Call Blocking with Toll Restriction
Delayed Disconnect
Distinctive Ringing - Calling and Called Number
Off-hook Warning Tone
Selective/Anonymous Call Rejection
Hot line and Warm Line Calling
Speed Dialing of 8 Numbers/Addresses
Music on Hold

Package

PAP2T Phone Adapter Unit
Power Adapter
RJ-45 Ethernet Cable
Quick Installation Guide

Specifications

Data networking

MAC Address (IEEE 802.3)
IPv4 - Internet Protocol v4 (RFC 791) upgradeable to v6 (RFC 1883)
ARP - Address Resolution Protocol
DNS - A Record (RFC 1706), SRV Record (RFC 2782)
DHCP Client - Dynamic Host Configuration Protocol (RFC 2131)
ICMP - Internet Control Message Protocol (RFC792)
TCP - Transmission Control Protocol (RFC793)
UDP - User Datagram Protocol (RFC768)
RTP - Real Time Protocol (RFC 1889) (RFC 1890)
RTCP - Real Time Control Protocol (RFC 1889)
DiffServ (RFC 2475), Type of Service - TOS (RFC 791/1349)
SNTP - Simple Network Time Protocol (RFC 2030)

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