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| Additional functions | Intercom, emergency call, HD Voice |
|---|---|
| Body color | Classic gray |
| Caller ID type | Caller ID |
| Display features | Touch screen |
| Display location | Base |
| Hearing aid compatible | Yes |
| Indicators | Visual ringer light, voice message waiting indicator, speakerphone indicator |
| Main features | Multiple VoIP protocol support, integrated Ethernet switch |
| Network protocols | TCP, TFTP, UDP, HTTP, DNS, HTTPS, SRTP, SNTP |
| Product description | Yealink T55A - Skype for Business Edition - VoIP phone with caller ID |
| Quality of service | IEEE 802.1Q (VLAN), IEEE 802.1p, Type of Service (ToS) |
| Voip | Yes |
| VoIP protocols | SIP, SIP v2 |
| Volume Control | Yes |
