Keenetic Linear

Two-Port Analog Telephone USB Adapter

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Micro PBX

The Phone Station component of KeeneticOS is a small IP PBX offering features such as internal telephone communications within a home or business, management of calls on shared external lines, call transfer, conferencing, and automatic call routing.

Crystal-clear voice calls

Keenetic Liner offers crystal-clear voice quality, enhanced clarity and seamless integration with any SIP-based IP telephony service provider.

Universal compatibility

Keenetic Linear is compatible with any Keenetic router with a USB port and provides a simple option for those who wish to use a traditional telephone in their home or business.


Key features
Model number KN-3110
USB ports USB 2.0
Telephony support 2 x RJ-11 FXS
System requirements
Compatible Keenetic router
One or two analogue phones
Network features
SIP 2.0 (RFC 3261)
SIP over TCP
SIP over UDP
SIP over TLS
SDP (RFC 2327)
RTP (RFC 1889)
RTCP (RFC 1890)
STUN (RFC 5389)
DNS A record (RFC 1706)
DNS SRV record (RFC 2782)
QoS layer 3 via  DSCP tagging
NAT Keepalive
SIP proxy redundancy via DNS SRV A records
Number of SIP lines supported 10
Voice features
G.711u codec support
G.711a codec support
FXS TX/RX gain adjustment
Terminating impedance adjustment
FXS ring cadence adjustment
DTMF relay: RFC2833
DTMF relay: in-band
Trans-hybrid balance filter echo minimization
Regional FXS setting profiles 27
FXS Flash detection
Tone FXS dial mode
Pulse FXS dial mode
Caller ID generation (number and name) ETSI
Off-hook warning tone generation
FXS distinctive ring
Phone features
Call forwarding: all
Call forwarding: busy
Call forwarding: no answer
FXS intercom calling
FXS port paging
Call waiting
Call hold
Call transfer
Call interception/pick-up
Do Not Disturb
Automatic post-dialling
Number of call history entries 500
Physical specifications and environment requirements
Device dimensions excluding antenna, w x d x h 60 mm x 100 mm x 22 mm
Device weight 53 g
Operating temperature 0–40°С
Operating humidity 20–95% non-condensing
Power supply voltage 5 V DC via a USB port
Package contents
USB cable
Quick start guide
Analogue telephone adapter
EU Declaration of Conformity CE-KN-3110-EN