Cisco CP-6921-C-K9 | 6921 2-Lines 2-Ports Ethernet Monochrome LCD IP Phone

Here are 12 technical specifications for the Cisco Unified IP Phone 6921:

1. Display: 396 x 81 pixels, monochrome, backlit
2. Ethernet switch: 10/100BASE-T
3. Protocol support: SCCP, SIP
4. Audio support: G.711a, G.711u, G.729a, G.729ab, G.722, iLBC
5. Speakerphone: Full-duplex
6. Headset support: RJ-9 jack
7. Power over Ethernet (PoE) support: Yes
8. XML support: Yes
9. Call features: Call waiting, call transfer, call hold, call forwarding, conference calls, etc.
10. Security features: Secure Real-Time Transport Protocol (SRTP), Transport Layer Security (TLS), etc.
11. Dimensions: 8.2 x 8.0 x 6.1 inches
12. Weight: 2.3 pounds

Helpful notes:
1. The Cisco Unified IP Phone 6921 is an affordable and reliable VoIP phone for small to medium-sized businesses.
2. With its backlit display and full-duplex speakerphone, it's easy to use in any lighting condition.
3. The phone's support for multiple call features and protocols makes it a versatile choice for businesses with varying communication needs.