Professional IP Phone · Color Display · 4 SIP Lines
🖥 VISUAL EXCELLENCE · 4 SIP LINES · BUILT-IN SECURITY

GLOBAL CS®
SIP-U121
Enterprise.

The step up from the SIP-U111 — HD color LCD display 2.4", 4 SIP lines, ×5 conference, 1,000 contacts, VPN/TLS/SRTP, PoE 802.3af/at — for teams that need more lines and greater visibility.

Download the datasheet →Key highlights
GLOBAL CS SIPU121
4 SIP LinesColor Display 2.4"Conference ×51,000 ContactsVPN · TLS · SRTPPoE 802.3af/atCE / FCC
4 SIP
Lines
Color
LCD display 2.4"
×5
Conference
VPN/TLS
Enterprise security
1 000
Contacts
Key highlights

4 Lines. Color display.
The step up.

4
Programmable SIP lines
Twice the SIP-U111 — manage more simultaneous streams
Color
HD LCD display 2.4"
Clearly view all 4 lines, statuses and contacts
×5
Conference
5 participants with no dedicated infrastructure
1 000
Local contacts
Twice the capacity of standard GLOBAL CS phones
Features

Everything you need.
No complexity.

KEY
🖥️

HD Color LCD Display 2.4"

View all 4 SIP lines, colored BLF statuses and caller information at a glance.

Color LCD · HD · Backlit
📱

4 Programmable SIP Lines

4 SIP identities on a single handset. Ideal for switchboard operators, team leads and multi-entity workstations. ×2 vs SIP-U111.

4 SIP · BLF · Status monitoring
👥

Conference ×5 · 1,000 Contacts

5 participants, 1,000-entry directory, LDAP/XML, blacklist.

×5 · 1,000 contacts · LDAP
🔒

VPN · TLS · SRTP · 802.1X

VPN, TLS, SRTP, 802.1X, HTTPS, anti-SIP, AES — 6 layers of enterprise protection.

VPN · TLS · SRTP · 802.1X · AES
🔊

Opus + G.722 + BNE + 300ms Jitter

Opus, G.722 HD, G.711, G.729, iLBC, G.726. 300 ms jitter buffer, BNE, AEC, VAD, PLC, AGC.

Opus · G.722 · BNE · Jitter 300ms
⚡

PoE af/at · USB-C · 17 Languages

Dual-standard PoE, USB-C DSS, optional Wi-Fi, 17 languages, -10°C to +50°C, 2–3 W.

PoE af/at · USB-C · 17 languages · 2–3W
Datasheet

Full specifications

📺 Display & Hardware

DisplayColor LCD 2.4" COLOR
SIP Lines4 lines ×2 vs U111
Conference×5 participants
Contacts1,000 entries
Languages17 languages
Power consumption2–3 W
Temperature-10°C to +50°C

⚡ Connectivity

PoE802.3af/at
Ethernet2× RJ-45 10/100M · Giga (G)
Interfaces2× RJ-9 · USB 2.0 · USB-C DSS
CertificationsCE · FCC

🔊 HD Audio

HD CODECsG.722 · Opus
Narrowband CODECsG.711 A/μ · G.723.1 · G.729AB · G.726 · iLBC
Jitter buffer300 ms
BNEBackground noise reduction
DTMFIn-band · RFC2833 · SIP INFO

🌐 Network & Security

SIPv1 RFC2543 · v2 RFC3261
NATICE / STUN
IPIPv4 / IPv6 / Dual Stack
Voice qualityRTCP-XR · VQ-RTCPXR
SecurityVPN · TLS · SRTP · 802.1X · AES
Admin.CDP · LLDP · TR-069
QoSDSCP · VLAN 802.1p/Q
Supported protocols

Compatible with all IPBX

SIP v1/v2
RFC2543/3261
TLS · SRTP
Voice security
ICE / STUN
NAT traversal
IPv4 / IPv6
Dual Stack
VLAN 802.1p/Q
Segmentation
CDP · LLDP
Discovery
TR-069
Zero deploy
FTP/TFTP/HTTPS
Provisioning
SIP PnP
Plug & Play
RTCP-XR
Voice quality
DSCP · QoS
Network quality
IEEE 802.1X
Network auth.
Let's get started

U121P quote
within 24h.

  • Custom quote based on volume
  • Live demo U121P + IMAGINE platform
  • Assisted VPN/TLS/SRTP configuration
  • GLOBAL CS technical support included