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Siemens Gigaset S645

Siemens Gigaset S645
alaScore 80

30 reviews

Aug, 2018

alaTest has collected and analyzed 30 reviews of Siemens Gigaset S645. The average rating for this product is 4.3/5, compared to an average rating of 4.0/5 for other Cordless Phones for all reviews.

We analyzed user and expert ratings, product age and more factors. Compared to other Cordless Phones the Siemens Gigaset S645 is awarded an overall alaScore™ of 80/100 = Very good quality.

Review analysis

(Based on 30 reviews)

Expert Reviews  

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Expert review by : Ampers (

Siemens Gigaset S645 DECT phone system


Is the more expensive Siemens phone all that it is cracked up to be and worth the extra money? Andrew Taylor has used this for three months and now gives his opinion.

This is a mini-review to give you some idea of what you will get, using a high end DECT phone system. Although priced at a little over a hundred pounds, this DECT phone has a tremendous amount going for it. Before getting into the nitty-gritty, let me...

Aug, 2006

Product Specifications

The Gigaset S645 takes professionalism one-step further. This combination of a Gigaset base station for cordless phones and an intercom makes a premium phone center to manage your calls in every way you like. One of many specialties the Gigaset S645 caters for are calls from the base station alone without the use of a handset. But with at least one Gigaset S44 handset attached, you can use the Gigaset S645 to make charge-free internal calls - a ready-made intercom. The Gigaset S645 offers voice dialing with superior sound quality and enhanced hands-free talking. Particularly handy is its voice-announced caller-ID. People who work a lot on the phone will really appreciate it: The Gigaset S645 helps to manage your daily life with an advanced data exchange function, e.g. for the phonebook, or SMS with up to 640 characters. Connected to the data adapter Gigaset M34 USB, you can even make hands-free calls over the Internet.

Answering Machine

Answering System Type:Digital
Recording Capacity:25min


Standby Time:Up to 150h
Talk Time:Up to 600 min

Call management

Call log entries:10
Calling line identification presentation (CLIP): Yes
Conference call: Yes
Redialing: Yes


Backlight buttons: Yes
Colour of product:Silver

Dimensions & Weight (Base)


Dimensions & Weight (Handset)



Display number of colours:4096 colours
Display number of lines:5
Display Resolution:101 x 80
Type:LCD display


Packaged Quantity:1
Product Line:Siemens Gigaset

Management features

Alarm Clock: Yes
Navigation key: Yes
Voice dialing: Yes


Phonebook capacity:200


Colour:Liquid silver

Other features

Alarms:10 polyphonic sounds
Antenna type:Internal
Dimensions (WxDxH):51 x 28 x 141 / 75 x 158 x 106
Full duplex: Yes
Mac compatibility:No / Yes
VoIP protocols:Y


Answering Machine: Yes
Maximum indoor range:50
Maximum outdoor range:300
Recording Time:25

Phone features

Multi base capability:4
Multi handset capability:6
Paging function: Yes
Polyphonic ring: Yes
Short Message Service (SMS): Yes
Speakerphone: Yes
VIP group function: Yes
VIP group with own melody: Yes

Ports & interfaces

Plug and Play: Yes
Wireless Connection:No / Yes


Battery technology:Nickel-Metal Hydride (NiMH)
Battery Type:AAA
Standby time:150
Talk Time:10
USB powered: Yes


Cordless Phone Standard:DECTGAP
Dialer Type:Dual keypad
Header Features:W/ answering system & caller ID
Type:Cordless phone

Telephone Features

Automatic Redial:Built-in / Yes
Caller ID:Built-in / Yes
Handset Locator:Built-in / Yes
Speakerphone:Built-in / Yes
Voice Mail Capability:Built-in / Yes

Weight & Dimensions

Base dimensions:158 x 75 x 106
Handset dimensions (WxDxH):51 x 28 x 141