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") ![](/images/getstarted-writetous-navbar-int_ZY7MOf.webp) ### Write to us Fill out our request form. Our experts will respond as soon as possible. [Write to us](/en/request-information "Write to us") ### Address Book [Saving the address book](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/address-book#section-3) [The role of the address book in cloud PBX and CTI](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/address-book#section-4) As devices have become ever more powerful, the function of the address book in your telephone has evolved tremendously. The address book allows you to choose the desired call participants simply by selecting their address book entry, without entering their [telephone number](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/national-international-phone-numbers). To begin with, the address book was a simple speed-dial memory, in which the telephone number of the party could be assigned to a specific key. With the progress of technology address book functions and data storage options grew considerably. Modern landline, or DECT phones, often offer address books with several hundred entries available. In addition to the name and the landline telephone number further information, such as other telephone and mobile numbers, can be stored. With smartphones and [Computer Telephony Integration (CTI)](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/cti) the address book is likened to database, with almost unlimited data storage capabilities for each individual contact. ### Saving the address book The first telephone address books had a simple memory function for numbers that were assigned to a button. The amount of memory and the number of possible entries was very limited. More modern handsets had address books in larger, non-volatile memories, which could be edited and easily accessed via a menu. With the advent of mobile phones the opportunity came to store address books directly to the [SIM card](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/sim-card). This offers the advantage that when changing the mobile phone, but keeping the SIM card, the address book is transferred and does not have to be re-entered. Modern smartphones allow their users to save the address book, together with extensive information about each contact, directly on the device itself or in the cloud. Cloud address books allow users to access their contacts with any device. The address books are synchronised automatically over the Internet. ### The role of the address book in cloud PBX and CTI The advent of the cloud [PBX](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/private-branch-exchange-pbx) and Computer Telephony Integration (CTI) has seen the telephone and computer merge ever closer together. Modern systems can establish telephone calls with just the click of a mouse from a link in an email program. With incoming calls, the extensive additional information can be displayed on the computer screen. This allows, for example, the person making the call to have access to their entire telephone history or to see customer records, also from other departments, such as purchase orders or complaints. This simplifies telephone use, making communication within the company more efficient. ### Related Articles ### Computer Telephony Integration (CTI) [Computer Telephony Integration (CTI)](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/cti) [Back](#) ![NFON Logo](/assets/logo-nfon.svg) News * [Events](https://www.nfon.com/en/news/events) * [Press](https://corporate.nfon.com/en/communication/) Customers * [Cloudya Login](https://start.cloudya.com/auth/login) * [Admin Portal](https://admin.nfon.com/) * [NFON Status](https://status.nfon.com/) About NFON * [Corporate](https://corporate.nfon.com/en/) * [Investor Relations](https://corporate.nfon.com/en/investor-relations/ir-at-a-glance/) * [Sustainability & ESG](https://corporate.nfon.com/en/sustainability/) * [Career](https://corporate.nfon.com/en/careers/) Legal * [GTC-SLA](/en/legal/gtc-sla) * [Legal Notice](/en/legal/legal-notice) * [Trust Center](https://www.nfon.com/en/trust-center/) * [Data Protection](/en/legal/data-protection) * [Cookie Settings](javascript:onclick=UC_UI.showSecondLayer()) © 2026 - NFON | All rights reserved.