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General| Mounting | Desk/Wall |
|---|---|
| Handset type | Wired handset |
| Product type | IP Phone |
| Product color | Black |
| Keypad illumination | Yes |
| Display diagonal | 7 \ |
| Display resolution | 800 x 480 pixels |
| AC adapter input voltage | 100 - 240 V |
| AC adapter output current | 2 A |
| AC adapter output voltage | 5 V |
| USB 2.0 ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 2 |
| Front camera | No |
| Voice codecs | CNG, G.711Mu, G.711a, G.722, G.723.1, G.726, G.729ab, VAD, iLBC |
| Lines quantity | 16 lines |
| Phonebook capacity | 1000 entries |
| Number of VoIP accounts | 16 |
| Dual-Tone Multi-Frequency (DTMF) modes | In-band, Out-of band, SIP info |
| Keypad number of keys | 42 |
| Security algorithms | AES |
| Networking standards | IEEE 802.3af |
| Ethernet LAN data rates | 10, 100, 1000 Mbit/s |
| Ethernet LAN interface type | Gigabit Ethernet |
| Supported network protocols | SIP v1, SIP v2, LLDP/CDP/DHCP, OpenVPN, IEEE802.1X, IPv6, HTTPS |
| Operating temperature (T-T) | -10 - 50 °C |
| Operating relative humidity (H-H) | 10 - 95 % |
| Cables included | LAN (RJ-45) |
| Number of handles included | 1 pc(s) |
| Harmonized System (HS) code | 85171800 |
Weight and Dimensions| Depth | 225 mm |
|---|---|
| Width | 266 mm |
| Height | 185 mm |
| Package depth | 263 mm |
| Package width | 324 mm |
| Package height | 128 mm |
Details copyright ownership and terms of use for the publication.
Outlines limitations of liability and absence of warranties for the product.
States compliance with essential requirements for CE and FCC.
Informs about CE marking compliance with EU directives.
Details FCC Part 15 rules for device operation and interference.
States compliance with Canadian ICES-003 and ICCS-03 rules.
Provides guidance on the disposal of electrical and electronic equipment.
Instructions for submitting feedback to improve documentation.
Details third-party software under GNU GPL license and source code access.
Lists topics covered in the guide, including setup and features.
Highlights major changes in guide version 81.20.
Describes the main hardware components like touch screen and keypad.
Explains various icons used on the status bar and line keys.
Details the meaning of different LED statuses on the phone.
Explains the two ways to customize phone configurations.
Lists available documentation for the SIP-T48S IP phone.
Covers settings like wallpaper, transparency, screen saver, and language.
Details volume, ring tones, and key tone adjustments.
Instructions for managing local directory, blacklist, and remote phone books.
Explains how to view, manage, and search call history records.
Covers headset use, Bluetooth, DSS keys, and account settings.
Covers placing, answering, ending calls, redialing, and call hold.
Details BLF monitoring, configuration, and alerts.
Explains how to record calls using USB drive or record keys.
Covers intercom calls, multicast paging, and music on hold.
Details SMS, voicemail, and message waiting indicators.
Information on service agreements applicable to the product.
Details Yealink's liability exclusions and limitations.
Provides crucial safety instructions for device usage and maintenance.
Lists all items included in the SIP-T48S IP phone package.
Guides through physical installation using desk or wall mount methods.
Details connecting the phone to wired and wireless networks.
Explains the phone boot-up process and how to view phone status.
Covers DHCP, static IPv4, and static IPv6 network configurations.
Instructions for activating Wi-Fi and connecting to wireless networks.
Guides through registering SIP accounts on the IP phone.
Explains the idle screen display and navigation elements.
Details how to enter data and navigate fields using the keypad.
Customizes the phone's background image for the idle screen.
Guides on changing the wallpaper displayed when the phone is idle.
Explains how to change wallpaper when unfolding the DSSkey list.
Details when the screen saver activates and how it stops.
Guides on setting time via SNTP server or manual configuration.
Instructions for changing the default administrator password.
Details how to activate, deactivate, and manage phone lock PIN.
Guides on setting active and inactive backlight levels and time.
Instructions for setting the language for UI and web interfaces.
Explains how to configure and access directory lists via web interface.
Details storing, adding, editing, and deleting contacts in local directory.
Guides on adding contacts to the blacklist to reject calls.
Instructions for setting up access URLs for remote phone books.
Details how to view call history records and detailed information.
Guides on making calls from the call history list.
Details how to assign functionalities to line keys.
Explains how to adjust the display length of key labels.
Guides on connecting and activating headset modes.
Details headset mode activation, deactivation, and priority settings.
Instructions for pairing, connecting, and managing Bluetooth headsets.
Guides on registering one or multiple SIP accounts on the phone.
Explains dial plan syntax, features like Dial Now, Area Code, Block Out.
Guides on configuring rules to replace strings in dialed numbers.
Details setting up rules for automatic dialing of numbers.
Guides on adding area codes for dialing numbers outside local areas.
Explains how to block specific numbers from being dialed.
Guides on specifying emergency numbers for dialling.
Details the live dialpad feature for auto-dialing.
Guides on setting the phone to automatically answer calls.
Details configuring auto redial for busy numbers.
Guides on notifying callers when a party becomes available.
Details setting up a recall key to call back the last incoming call.
Explains how to mute the microphone during calls or dialing.
Details mute functionality while dialing and persistent mute.
Guides on placing active calls on hold and retrieving them.
Details DND modes (phone and custom) for call rejection.
Explains Always, Busy, and No Answer forwarding options.
Guides on forwarding calls manually while the phone is ringing.
Details how to enable/disable call waiting and warning tones.
Guides on configuring and using network conference calls.
Explains how to set up local conferences with up to 3 parties.
Guides on setting up call parking and retrieval using FAC mode.
Details setting up call park and retrieval using transfer mode.
Explains how to pick up calls directed to specific extensions.
Guides on setting up group pickup codes for call centers.
Guides on configuring the phone for BLF monitoring.
Details how to assign BLF functionality to a line key.
Explains global and per-line configuration for directed pickup.
Details how to set up BLF list URIs and codes.
Guides on recording calls using a USB flash drive.
Explains how to record active calls and conferences.
Details setting up record keys for call recording.
Guides on logging out and into accounts for shared phone use.
Details how to configure an intercom key for direct extension calls.
Covers auto-answer, mute, tone, and barge features for intercom.
Guides on placing intercom calls to idle extensions.
Explains how to answer incoming intercom calls.
Details setting up multicast paging keys for broadcasting announcements.
Guides on setting up addresses to receive multicast streams.
Details setting up the SIP URI for the Music on Hold Server.
Guides on setting up ACD keys for call center functionality.
Instructions for logging into the ACD system using User ID and Password.
Explains how SCA allows sharing an extension across multiple phones.
Guides on automatically assigning DSS keys for shared lines.
Details setting up private hold for shared line calls.
Guides on configuring access codes for call retrieval.
Instructions for placing calls using shared lines.
Guides on answering incoming calls on shared lines.
Instructions for placing calls on public or private hold.
Guides on retrieving calls placed on hold from shared lines.
Explains how to retrieve calls from other shared phones.
Explains BLA allowing users to share a SIP line across multiple phones.
Guides on sharing BLA numbers across multiple phones.
Details sending, receiving, reading, and deleting SMS messages.
Guides on how to access and read received text messages.
Instructions for composing and sending new text messages.
Covers leaving and listening to voice mails.
Explains how MWI indicates new voice messages.
Details parameters for subscribing to MWI service.
Guides on enabling MWI subscription through the web interface.
Instructions for subscribing MWI service to the voicemail number.
Provides a comprehensive list of time zones and their names.
Illustrates the hierarchical structure of the phone's menu system.
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