Cisco 7921G Unified Wireless IP Phone

Cisco 7921G is a wireless IP phone bases on the Wi-Fi (ETSI; CCM/CCME UL Reqd;Battery/PS Not Included) data transfer technology.

This model of the phone presents itself as a convenient in use wireless IP phone with IEEE 802.11a/b/g support, which ensures complete voice communication in compatibility with Cisco Unified CallManager and Cisco Aeronet Wi-FI (IEEE 802.11 a/b/g) access points. This phone has color TFT display with 176x220 pixel resolution and a built in speaker phone.
Technical characteristics:
2inch color LCD display with 176x220 pixel resolution Network standards: IEEE 802.11a, IEEE 802.11b on IEEE 802.11g on 2,4Ghz or 5Ghz frequency 2 programmable soft keys providing access to applications and additional features of the phone Supported Audio Codec: G.711a, G.711u, G.729a, G.729ab, G.722 Support for XML applications Battery: 100 hours waiting mode or 12 hours talking mode. Protocols: DHCP, TFTP, DNS
AC adapter and power block are not included with this phone

Providers in database: 6433

Echo cancellation module VPMADT032

VPMADT032 echo cancellation module is meant to be used with the Digium IP telephony boards; it provides echo cancellation for configurable long "tail" of up to 128 ms (1024 samples) simultaneously for all ports of the board. All IP-PBX Asterisk servers, connected to the telephone network (PSTN) have one common problem, which is "hybrid echo" - echo obtained due to the difference in the load-wire and four-wire telephone circuits. Echo appears as a distorted reflection and a detainee of the caller's voice, who is subscribed to IP-PBX Asterisk while talking to PSTN subscribers.

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