IP telephones and terminal devices

An IP telephone resembles a classical telephone set as far as its appearance is concerned. It digitalizes analogue voice signal directly and converts it into packets of the IP protocol (Internet Protocol), which are subsequently transmitted along the telephone network to the person called.

An IP telephone makes many standard exceeding functions, which are well-known from mobile phones, available for the user.

The use of IP telephones is easy; the user operates an IP telephone in the same manner as the classical telephone.

For the purpose of the viaPhone service, it is possible to use a classical analogue telephone set as well, however, equipped with a special adapter (a mediagateway).

A list of IP telephones and terminal devices offered for the viaPhone service.

The listed IP telephones and devices can be bought directly from T-Systems during orderal of the services (in the Contract from). The free of charge configuration is included.

Siemens Gigaset C470 IP - cordless VoIP telephone

This device is not available any more on the market, it is replaced by a new model Siemens C590 IP. The price remains the same.

This devices is not available any more on the market, it is replaced by a new model Siemens C590 IP. The price remains the same.

Stylish cordless telephone for VoIP as well as standards fixed analogue line. The follower of the well-proved Siemens Gigaset C450 IP. The telephone uses an expandable phone system that will support up to 6 handsets, giving you the freedom to make up to 3 parallel calls .ECO DECT technology - saving 60 % of energy thanks to smart power management so it saves you money and is friendlier to the environment.


  • Siemens Gigaset C470 IP ECO DECT – for 60% less energy use1 and variable reduction of transmitting power (In comparison to Siemens conventional cordless phones)
  • Expandable phone system with multiline calling for up to 6 handsets and 6 SIP accounts from different providers
  • Easy configuration of internet telephony (VoIP) without a PC
  • Gigaset.net - Worldwide free of charge calls between Gigaset.net supporting VoIP phones
  • Up to 3 calls in parallel: 2 VoIP calls and 1 fixed-line call with multiple handsets
  • Paging and Instant Messaging (buddy list, chatting, presence status)
  • Increased virus protection thanks to protected operating system
  • Convenient handsfree talking in brilliant sound quality 
  • CLIP function – displaying the caller`s number
  • Illuminated display with  4096 colors and 128 x  128 pixels
  • Intuitive icon-based menu (multilanguage)
  • Phonebook for up to 150 names and numbers
  • 15 ring tones – standard and polyphonic
  • Alarm clock, kid nun – room monitoring
  • Reach: 50m inside the building, 300m outside the building

Files to download:

Linksys SPA-921

This devices is not available any more on the market, it is replaced by a new model Cisco SPA-303. The price remains the same.

Stylish and functional in design, the SPA-921 IP Phone is ideal for a residence or business. The SPA-921 leverages industry leading VoIP technology from Linksys to deliver an upgradeable high quality IP phone that is unparalleled in features, value, and support. Standard features on the SPA921 include a high resolution graphical display, speakerphone, and a 2.5 mm head-set port. The SPA921 supports one line with two call appearances and provides support for three way conferencing, attended call transfer, and placing a call on hold to answer an incoming call. The line can be configured as a unique phone number (or extension), or can be configured to share a number that is assigned to multiple phones.


  • Linksys SPA-921Backlit Pixel Based Display: 128x64 Monochrome Graphical LCD
  • Line Status - Active Line Indication, Name and Number
  • Menu Driven User Interface
  • Personal Directory with Auto-dial (100 entries)
  • Do Not Disturb (callers hear line busy tone)
  • Digits Dialed with Number Auto-Completion
  • Anonymous Caller Blocking
  • URI (IP) Dialing Support (Vanity Numbers)
  • Multiple Ring Tones with Selectable Ring Tone per Line
  • Called Number with Directory Name Matching
  • Call Number using Name - Directory Matching or via Caller ID
  • Subsequent Incoming Calls with Calling Name and Number
  • Call Duration and Start Time Stored in Call Logs
  • Call Timer
  • Name and Identity (Text) Displayed at Start Up
  • Distinctive Ringing Based on Calling and Called Number
  • Ten User Downloadable Ring Tones - Ring Tone Generator Free from www.linksys.com
  • Speed Dialing, Eight Entries
  • Configurable Dial/Numbering Plan Support
  • High Quality Handset and Cradle
  • Built-In High Quality Microphone and Speaker

Files to download:

Linksys PAP2T

Analogue telephone adaptor with two FXS ports. Enables connection of a classical analogue telephone or a fax machine.

  • Linksys  PAP2Thigh quality of voice transfer
  • attractive price
  • SIP protocol
  • 1x RJ-45 Ethernet 10Base
  • 2x RJ-11 FXS port
  • telephone lines can have 2 independent telephone numbers
  • supported codecs G.711, G.726, G.729, G.723.1
  • configuration via a web interface
  • supports „echo cancellation“ and „Voice Activity Detection (VAD)“
  • size: 101x101x15mm
  • weight: 0.15 kg

Files to download:



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