SIP RFC 3261 HD Voice & wideband | PoE IEEE 802.3af Microsoft Teams / Cisco |
IP System Phones (SIP)
SIP IP phones (Session Initiation Protocol, RFC 3261) are the standard for all modern VoIP installations and completely replace ISDN system phones in new installations. They connect via Ethernet and can be powered directly via the network cable through PoE (Power over Ethernet, IEEE 802.3af/at) – without a separate mains adapter. High-quality SIP phones support HD Voice (G.722, 50–7,000 Hz) and wideband codecs that significantly improve voice quality compared to ISDN. Quality assurance is achieved via QoS (Quality of Service, DSCP/CoS marking) in the network. Manufacturers such as Snom and Yealink offer series from entry-level desk phones to executive comfort phones with colour display, Bluetooth, USB and integrated DECT dongle. Microsoft Teams-certified IP phones (e.g. Yealink T5x, Poly Edge E series) integrate directly into Teams and show presence status, calendar entries and Teams contacts on the display. Provisioning via TR-069, TFTP or manufacturer-specific cloud platforms (e.g. Snom SRAPS, Yealink RPS) enables zero-touch deployment for large rollouts. |
Top sellers in System Telephones IP
System Telephones IP from Agfeo
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 AGFEO system telephone ST42 IP black
The ST 42 IP for current AGFEO communications systems with LAN technology. Absolutely new in this class is the Combi modular bay, which can be equipped with Bluetooth technology or EnOcean radio ...Lieske Part No.: 342438 Mfg Part No: 6101320 Type: ST 42 IP schwarz |
285,00 EUR
 ≈ £244.53 | ≈ $326.61
Delivery time from supplier's stock (ca.) 4 workdaysinfo_outline
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AGFEO system telephone ST45 IP black, demonstration device
With the ST 45 IP in a new world. Designed for office professionals phone is now equipped for VoIP telephony. Connected via the existing network, new possibilities open up in the communication ... Lieske Part No.: 1000011 Mfg Part No: 6101322 Type: ST 45 IP schwarz |
350,55 EUR
≈ £300.77 | ≈ $401.73
in stockinfo_outline
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AGFEO system telephone ST45 IP black
With the ST 45 IP in a new world. Designed for office professionals phone is now equipped for VoIP telephony. Connected via the existing network, new possibilities open up in the communication ... Lieske Part No.: 924361 Mfg Part No: 6101322 Type: ST 45 IP schwarz |
350,55 EUR
≈ £300.77 | ≈ $401.73
Delivery time from supplier's stock (ca.) 5 workdaysinfo_outline
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AGFEO system telephone ST22 IP black
The ST 22 IP - professionalism bundled on the essentials. With this system you will telephone at home right away, without any hidden features. Pick up the phone, it's worth it. > Highlights: -10 ... Lieske Part No.: 256226 Mfg Part No: 6101424 Type: ST 22 IP schwarz |
207,10 EUR
≈ £177.69 | ≈ $237.34
in stockinfo_outline
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AGFEO system telephone ST56 IP SENSORfon pure white
ST 56 IP - making calls with SENSORfon function In addition to the new, modern design, the ST 56 IP business office telephone offers a large color display that makes the status information even easier ... Lieske Part No.: 1265108 Mfg Part No: 6101635 Type: ST 56 IP SENSORfon reinweiß |
406,60 EUR
≈ £348.86 | ≈ $465.96
Delivery time from supplier's stock (ca.) 5 workdaysinfo_outline
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System Telephones IP from ALCATEL-LUCENT
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 ALCATEL-LUCENT ENTERPRISE Netzteil 48 V Europa x4 kompatibel mit My IC Phone 8082 und IP Touch 8 Series
Lieske Part No.: 233901 Mfg Part No: 3MG27006AA |
49,00 EUR
≈ £42.04 | ≈ $56.15
Delivery time from supplier's stock (ca.) 9 workdaysinfo_outline
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System Telephones IP from Auerswald
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 Auerswald COMfortel 1400 IP black
COMfortel 1400 IP, blackLieske Part No.: 408878 Mfg Part No: 90071 |
228,87 EUR
≈ £196.37 | ≈ $262.29
Delivery time from supplier's stock (ca.) 6 workdaysinfo_outline
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Auerswald COMfortel 2600 IP black
COMfortel 2600 IP, black Lieske Part No.: 318712 Mfg Part No: 90073 |
335,30 EUR
≈ £287.69 | ≈ $384.25
Delivery time from supplier's stock (ca.) 6 workdaysinfo_outline
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System Telephones IP from Grandstream
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 Grandstream GXP-1625 PoE
The model GXP1625 is Grandstream s standard IP phone for small and medium businesses. The Linux-based phone can handle two SIP trunks / identities and has three user-programmable soft keys, HD audio, ...Lieske Part No.: 780577 Mfg Part No: 121404 |
50,05 EUR
≈ £42.94 | ≈ $57.36
Made to order · Delivery time approx. 4 workdaysinfo_outline
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System Telephones IP from Wildix
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 Wildix ForcePro5 Bluetooth and WiFi makes your WorkForce Pro 5th generation
Lieske Part No.: 2142888 Mfg Part No: ForcePro5 |
231,36 EUR
≈ £198.51 | ≈ $265.14
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix SpiralCord-10 10pcs Spiral Cord for ForcePro5, WorkForce5, WelcomeConsole5, Start5
Lieske Part No.: 2142889 Mfg Part No: SpiralCord-10 |
56,84 EUR
≈ £48.77 | ≈ $65.14
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix Start5 The Basic Phone 5th generation
Lieske Part No.: 2142890 Mfg Part No: Start5 |
135,24 EUR
≈ £116.04 | ≈ $154.99
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix Start5-6HS 6 Handsets for Start5
Lieske Part No.: 2142891 Mfg Part No: Start5-6HS |
90,27 EUR
≈ £77.45 | ≈ $103.45
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix Start5-Wallmount Wall mount bracket for Start5 - 1 Unit
Lieske Part No.: 2142892 Mfg Part No: Start5-Wallmount |
15,28 EUR
≈ £13.11 | ≈ $17.51
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix SuperVision The exclusive deskphone designed for Top Managers
Lieske Part No.: 2142893 Mfg Part No: SuperVision |
1.079,82 EUR
≈ £926.49 | ≈ $1,237.47
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix SuperVision-6HS 6 Handsets for SuperVision
Lieske Part No.: 2142894 Mfg Part No: SuperVision-6HS |
90,04 EUR
≈ £77.25 | ≈ $103.19
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix SuperVision5 The exclusive deskphone designed for Top Managers v5
Lieske Part No.: 2142895 Mfg Part No: SuperVision5 |
325,22 EUR
≈ £279.04 | ≈ $372.70
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix Vision SIP Gigabit phone, Android 5.1, Camera, Wi-Fi, Bluetooth, Touchscreen, Up to 120 BLF keys. Black
Lieske Part No.: 2142896 Mfg Part No: Vision |
489,94 EUR
≈ £420.37 | ≈ $561.47
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix Vision-6HS 6 Handsets for Vision, WP600A/ACG
Lieske Part No.: 2142897 Mfg Part No: Vision-6HS |
86,22 EUR
≈ £73.98 | ≈ $98.81
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix Vision-6HS-White 6 Handsets for Vision White, WP600ACG White
Lieske Part No.: 2142898 Mfg Part No: Vision-6HS-White |
86,22 EUR
≈ £73.98 | ≈ $98.81
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix WallMount24 Wall mount bracket for WorkForce5, ForcePro5 - 1 Unit
Lieske Part No.: 2142899 Mfg Part No: WallMount24 |
15,28 EUR
≈ £13.11 | ≈ $17.51
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix WallMount5 Wall mount bracket for WorkForce5, ForcePro5 - 1 Unit
Lieske Part No.: 2142900 Mfg Part No: WallMount5 |
15,28 EUR
≈ £13.11 | ≈ $17.51
On order · Delivery time approx. 12 workdaysinfo_outline
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Wildix WelcomeConsole-EXT Keypad expansion for WelcomeConsole and WP490G, max 40 keys, color display
Lieske Part No.: 2142901 Mfg Part No: WelcomeConsole-EXT |
183,85 EUR
≈ £157.74 | ≈ $210.69
On order · Delivery time approx. 12 workdaysinfo_outline
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The Wildix Attendant Console 5th generation
Lieske Part No.: 2142902 Mfg Part No: WelcomeConsole5 |
286,09 EUR
≈ £245.47 | ≈ $327.86
On order · Delivery time approx. 12 workdaysinfo_outline
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IP System Phones (SIP) – Technical Background & Applications
SIP IP phones (Session Initiation Protocol, RFC 3261) are the standard for all modern VoIP installations and completely replace ISDN system phones in new installations. They connect via Ethernet and can be powered directly via the network cable through PoE (Power over Ethernet, IEEE 802.3af/at) – without a separate mains adapter. High-quality SIP phones support HD Voice (G.722, 50–7,000 Hz) and wideband codecs that significantly improve voice quality compared to ISDN. Quality assurance is achieved via QoS (Quality of Service, DSCP/CoS marking) in the network. Manufacturers such as Snom and Yealink offer series from entry-level desk phones to executive comfort phones with colour display, Bluetooth, USB and integrated DECT dongle. Microsoft Teams-certified IP phones (e.g. Yealink T5x, Poly Edge E series) integrate directly into Teams and show presence status, calendar entries and Teams contacts on the display. Provisioning via TR-069, TFTP or manufacturer-specific cloud platforms (e.g. Snom SRAPS, Yealink RPS) enables zero-touch deployment for large rollouts.
IP PBX counterparts: Telephone Systems. DECT system phones for cordless variant: DECT System Phones. Headsets for SIP phone connection: Headsets. All-IP migration and pilot installation: +49 (0)7666 / 88499-0.
Application Areas
| ✓ Business Telephony & Call Centres | ✓ Authorities & Public Institutions |
| ✓ Industrial Environments & Production Halls | ✓ Hotels & Hospitality |
| ✓ Hospitals & Care Facilities | ✓ Data Centres & IT Infrastructure |
Frequently Asked Questions
▶ What is PoE and how much power does it deliver? PoE (Power over Ethernet) feeds direct current over the data conductors of the Ethernet cable (Cat.5e or better). Standards: IEEE 802.3af (PoE): max. 15.4 W at switch port (12.95 W at device) – sufficient for most SIP phones. IEEE 802.3at (PoE+): max. 30 W – for phones with colour display, WiFi and USB charging. IEEE 802.3bt (PoE++): max. 60 or 100 W – for cameras, APs, panels. The switch must support PoE and have sufficient budget for all ports. |
▶ How do I register a SIP phone with my IP PBX? Basic requirement: PBX with SIP server (Auerswald COMpact, FRITZ!Box, Asterisk/FreePBX, 3CX, etc.) and a configured SIP account. On the phone, configure: SIP server IP (or FQDN), SIP username (extension), SIP password and optionally registrar/proxy. Most manufacturers support auto-provisioning via DHCP option 66 (TFTP server) or manufacturer-specific cloud URLs – then MAC address entry in the PBX suffices for zero-touch. |
▶ What is the difference between a SIP phone and an IP system phone? A SIP phone implements only the open SIP protocol (RFC 3261) – it works manufacturer-independently with any SIP server. An IP system phone additionally supports manufacturer-specific PBX extensions: e.g. Auerswald COMfortel for Auerswald systems with COMfortel app functions (speed dial, busy lamp field, attendant console). These additional functions are only available when phone and system are from the same manufacturer or explicitly compatible. |
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