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| Features | |
|---|---|
| Number of function keys | 6 |
| Dual-Tone Multi-Frequency (DTMF) modes | In-band, Out-of band, SIP info |
| International Protection (IP) code | IP67 |
| Integrated voicemail | Yes |
| Handset type | Wireless handset |
| Device lock | Yes |
| Volume control | Buttons |
| Headset connectivity | 3.5 mm |
| Product colour | Black |
| Backlight keypad | Yes |
| Hearing aid compatibility | Yes |
| Technical details | |
| Number of function keys | 6 |
| Dual-Tone Multi-Frequency (DTMF) modes | In-band, Out-of band, SIP info |
| International Protection (IP) code | IP67 |
| Integrated voicemail | Yes |
| Answering machine | Yes |
| Handset type | Wireless handset |
| Device lock | Yes |
| Volume control | Buttons |
| Quick start guide | Yes |
| Headset connectivity | 3.5 mm |
| Direct call | Yes |
| Backlight keypad | Yes |
| Hearing aid compatibility | Yes |
| Power | |
| Battery voltage | 3.7 V |
| Battery type | Built-in |
| Battery technology | Lithium-Ion (Li-Ion) |
| Battery capacity | 3100 mAh |
| AC adapter output current | 2 A |
| Talk time | 13 h |
| Standby time | 300 h |
| AC adapter output voltage | 5 V |
| AC adapter input voltage | 100 - 240 V |
| Security | |
| Security algorithms | AES, HTTPS, MD5, SRTP, TLS, WPA, WPA2, WPA3 |
| Design | |
| Product type | IP mobile phone |
| International Protection (IP) code | IP67 |
| Handset type | Wireless handset |
| Device lock | Yes |
| Product colour | Black |
| Backlight keypad | Yes |
| Protection features | Anti-bacterial, Chemical resistant, Drop resistant |
| Performance | |
| Dual-Tone Multi-Frequency (DTMF) modes | In-band, Out-of band, SIP info |
| Hearing aid compatibility | Yes |
| Phone features | |
| Message-waiting indicator (MWI) | Yes |
| Call transfer | Yes |
| Call return | Yes |
| Number of VoIP accounts | 4 |
| Answering machine | Yes |
| Speed dialling | Yes |
| Redialing | Yes |
| Phonebook capacity | 1000 entries |
| Intercom | Yes |
| Full duplex | Yes |
| Direct call | Yes |
| Caller ID | Yes |
| Call waiting | Yes |
| Call pick up | Yes |
| Call park | Yes |
| Call hold | Yes |
| Call forwarding | Yes |
| Anonymous call | Yes |
| Call history | Yes |
| Customizable wallpaper | Yes |
| Emergency call | Yes |
| Management features | |
| Number of function keys | 6 |
| Integrated voicemail | Yes |
| Volume control | Buttons |
| Voicemail indication | Yes |
| Display | |
| Touchscreen | No |
| Display resolution | 240 x 320 pixels |
| Display diagonal | 6.1 cm (2.4") |
| Display | TFT |
| Audio | |
|---|---|
| Voice codecs | AEC, AGC, AJB, CNG, G.711u, G.722, G.723.1, G.726, G.729, G.729A, G.729B, PCMA, PLC, VAD |
| Noise reduction | Yes |
| Microphone mute | Yes |
| Network | |
| Networking standards | IEEE 802.1x |
| Bluetooth version | 5.0 |
| Wi-Fi standards | Wi-Fi 6 (802.11ax) |
| Wi-Fi | Yes |
| Security algorithms | AES, HTTPS, MD5, SRTP, TLS, WPA, WPA2, WPA3 |
| Quality of Service (QoS) support | Yes |
| DHCP client | Yes |
| Bluetooth | Yes |
| Colour | |
| Product colour | Black |
| Microphone | |
| Microphone mute | Yes |
| Ports & interfaces | |
| Headset connectivity | 3.5 mm |
| USB Type-C ports quantity | 1 |
| Endurance | |
| International Protection (IP) code | IP67 |
| Battery | |
| Battery voltage | 3.7 V |
| Battery type | Built-in |
| Battery technology | Lithium-Ion (Li-Ion) |
| Battery capacity | 3100 mAh |
| Operational conditions | |
| Storage relative humidity (H-H) | -30 - 70% |
| Operating temperature (T-T) | 0 - 40 °C |
| Operating relative humidity (H-H) | 10 - 95% |
| Weight & dimensions | |
| Width | 55.3 mm |
| Depth | 25.9 mm |
| Height | 160.1 mm |
| Package width | 104 mm |
| Package depth | 90 mm |
| Package height | 181 mm |
| Weight | 218 g |
| Packaging content | |
| AC adapter included | Yes |
| Number of handles included | 1 pc(s) |
| Quick start guide | Yes |
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|---|---|---|---|---|---|---|
| SKU |
1301221
|
CP-3905=
|
T48GN
|
CP-7821-K9=
|
CP-7841-K9=
|
CP-8841-K9=
|
| Manufacturer |
Yealink
|
Cisco
|
Yealink
|
Cisco
|
Cisco
|
Cisco
|
| Product type |
IP mobile phone
|
IP phone
|
IP phone
|
IP phone
|
IP phone
|
IP phone
|
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