Corded ISDN Phones
Corded ISDN phones (S0 desk phones) use the digital ISDN BRI connection (S0 bus, 2B+D) and offer significantly more functions than analogue devices: CLIP (caller ID), CLIR, MSN assignment for multiple numbers, digital voice quality and faster connection setup times. System phones for ISDN PBX systems (e.g. Auerswald COMfort 1200 ISDN) additionally offer PBX functions such as direct call, secretary-boss and call log. With advancing all-IP migration, ISDN phones are becoming rarer; remaining stock and used devices are available. For new installations, we recommend going directly to SIP IP phones.
Common Manufacturers: Auerswald • Agfeo • Siemens • Tiptel • Elmeg
ISDN from Agfeo
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 Agfeo ST 53 SENSORfon sw system telephone for systems with S0/UP0 interface 6101545
For ES systems from version 2.2. Movable and illuminated graphic display (including dark mode), control pad for effective operation, proximity sensor (display, tone call), soft keys, flat design and ...Lieske Part No.: 1597896 Mfg Part No: 6101545 Type: ST 53 SENSORfon |
302,94 EUR
 ≈ £260.23 | ≈ $350.80
Delivery time on requestinfo_outline
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Agfeo ST 53 IP SENSORfon sw system telephone for systems with ASIP protocol 6101571
For ES (from version 2.2) and HyperVoice systems. Movable and illuminated graphic display (including dark mode), control pad for effective operation, proximity sensor (display, tone call), soft keys, ... Lieske Part No.: 1598064 Mfg Part No: 6101571 Type: ST 53 IP SENSORfon schwarz |
290,70 EUR 302,94 EUR
≈ £249.71 | ≈ $336.63
Delivery time from supplier's stock (ca.) 3 workdaysinfo_outline
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Agfeo DECT 75 IP black handheld device for base dustproof 6101577
DECT 75 IP The handheld part for workshops and retailers strong | robust | water-resistant jet-proof and dust-proof according to IP 65 protection class works in environments from -10 to +55 degrees ... Lieske Part No.: 1102302 Mfg Part No: 6101577 Type: DECT 75 IP schwarz |
411,35 EUR 428,67 EUR
≈ £353.35 | ≈ $476.34
Delivery time from supplier's stock (ca.) 3 workdaysinfo_outline
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Agfeo DECT 77 IP white handheld device for base dustproof 6101578
DECT 77 IP Particularly robust not only for healthcare and medical use | water resistant | antibacterial antibacterial in accordance with ISO 22196 (2nd Edition) high-quality, luminous membrane ... Lieske Part No.: 1102301 Mfg Part No: 6101578 Type: DECT 77 IP weiß |
411,35 EUR 428,67 EUR
≈ £353.35 | ≈ $476.34
Delivery time from supplier's stock (ca.) 3 workdaysinfo_outline
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Agfeo DECT 78 IP telephone cordless, water/oil resistant, antibacterial. 6101650
DECT handheld device for the AGFEO DECT IP base! Housing rubber coating, dustproof, shockproof and waterproof according to protection class IP65, suitable for antibacterial use according to ISO 22196 ... Lieske Part No.: 1593682 Mfg Part No: 6101650 Type: DECT 78 IP |
428,67 EUR
≈ £368.23 | ≈ $496.40
Delivery time from supplier's stock (ca.) 4 workdaysinfo_outline
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Agfeo ST 54 IP SENSORfon black desk telephone with S0 and UP0 6101728
ST 54 IP - Telephoning with SENSORfon function With the new SENSORfon ST 54 IP we are responding to the wishes of our specialist retailers! A highlight of the new ST 54 IP business office telephone ... Lieske Part No.: 1373258 Mfg Part No: 6101728 Type: ST 54 IP SENSORfon schwarz |
351,50 EUR 366,30 EUR
≈ £301.94 | ≈ $407.04
Delivery time from supplier's stock (ca.) 3 workdaysinfo_outline
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Agfeo ST 54 IP SENSORfon silver desk telephone with S0 and UP0 6101729
ST 54 IP - Telephoning with SENSORfon function With the new SENSORfon ST 54 IP we are responding to the wishes of our specialist retailers! A highlight of the new ST 54 IP business office telephone ... Lieske Part No.: 1373261 Mfg Part No: 6101729 Type: ST 54 IP SENSORfon silber |
351,50 EUR 366,30 EUR
≈ £301.94 | ≈ $407.04
Delivery time from supplier's stock (ca.) 3 workdaysinfo_outline
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ISDN from Auerswald
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 Auerswald 90242 COMfortel M-720 sw/gr with charging cradle + power supply cordless telephone
The COMfortel M-720 not only impresses with its elegant appearance and slim design, but also with its high performance. Because the handpiece is equipped with first-class business functions such as ...Lieske Part No.: 1956029 Mfg Part No: 90242 |
158,10 EUR
≈ £135.81 | ≈ $183.08
Delivery time on requestinfo_outline
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ISDN from KOMSA AG
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KOMSA AG 20002848 AVM AVM FRITZ!Fon C6 Komfort schnurlos Telefon Full-Duplex-Freispr.
AVM FRITZ!Fon C6 auf einen Blick: Komfort-Schnurlostelefon mit intuitiver Menüführung für alle FRITZ!Box-Modelle mit DECT-BasisstationBrillante HD-Telefonie, ... Lieske Part No.: 2144877 Mfg Part No: 20002848 |
99,83 EUR
≈ £85.75 | ≈ $115.60
Delivery time on requestinfo_outline
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ISDN from Tiptel
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 Tiptel 1020040 Retell Ergophone 24
24 lettered keys for direct calls-20 possible single-digit numbers between the phone socket and connect existing analog telephone-suited for cordless DECT phones-No external power supply or batteries ...Lieske Part No.: 358225 Mfg Part No: 1020040 |
32,44 EUR
≈ £27.87 | ≈ $37.57
Delivery time on requestinfo_outline
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Tiptel Ergo Phone 1200
Ring memory, messages must not be deleted werden- An announcement, 20 records 40 minutes Aufnahmekapazität- flash memory without batteries (data retention) - 4 buttons for Hauptfunktionen- 5 hidden ... Lieske Part No.: 154394 Mfg Part No: 1081200 |
40,57 EUR
≈ £34.85 | ≈ $46.98
Delivery time on requestinfo_outline
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ISDN from Yealink
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 Yealink wall mount for EXP40
Lieske Part No.: 1570205 Mfg Part No: WMB-EXP40 |
13,44 EUR
≈ £11.54 | ≈ $15.56
Delivery time on requestinfo_outline
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Corded ISDN Phones – Product Details & Advice
Corded ISDN phones (S0 desk phones) use the digital ISDN BRI connection (S0 bus, 2B+D) and offer significantly more functions than analogue devices: CLIP (caller ID), CLIR, MSN assignment for multiple numbers, digital voice quality and faster connection setup times. System phones for ISDN PBX systems (e.g. Auerswald COMfort 1200 ISDN) additionally offer PBX functions such as direct call, secretary-boss and call log. With advancing all-IP migration, ISDN phones are becoming rarer; remaining stock and used devices are available. For new installations, we recommend going directly to SIP IP phones.
Analogue alternatives: Analogue Phones. IP system phones: IP System Phones.
Frequently Asked Questions
▶ Do ISDN phones still work after the all-IP migration? No – not directly. ISDN phones require an S0 bus connection. After all-IP conversion, the physical ISDN exchange line is discontinued. Via an IP PBX with integrated S0 port or an ISDN-to-SIP gateway, ISDN phones can continue to operate. Recommendation: switch to SIP phones long-term. |
▶ What is MSN in ISDN? MSN (Multiple Subscriber Number) refers to the multiple numbers that can be assigned to an ISDN BRI connection (typically 3–10 MSNs). Each ISDN terminal responds only to its assigned MSN – so phone, fax and modem can have different numbers on a shared connection. |
▶ Can I call and send fax simultaneously via ISDN? Yes – ISDN BRI has 2 independent B-channels (64 kBit/s each). One can be used for calling while the other transmits a fax. Prerequisite: terminals are correctly configured (MSN assignment, no EKTS conflict). When all 2 B-channels are in use, no further connections are possible. |
Why buy from us?
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