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https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-ip-phone-7900-series/prod_qas0900aecd80601788.html
Dec 22, 2013 · A. No, the Cisco Unified Wireless IP Phone 7921G has a different form factor and different connector than the Cisco Unified Wireless IP Phone 7920, …
https://community.cisco.com/t5/other-wireless-mobility-subjects/when-will-7921g-7925-support-sip/td-p/2139613
Wireless 7921G/7925G/7926G will never support SIP. If you are using a non-Cisco CallManager (like Asterisk), then there are ways around this and you can download modules to allow your third-party call servers to talk to SCCP phones.
https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-ip-phone-7900-series/product_data_sheet0900aecd805e315d.html
Dec 22, 2013 · The Cisco Unified Wireless IP Phone 7921G supports a host of calling features and voice-quality enhancements. The device is an advanced media IP phone, delivering wideband audio capabilities. In addition to wideband audio, Cisco Unified Wireless IP Phone 7921G supports …
https://community.cisco.com/t5/ip-telephony-and-phones/cisco-unified-wireless-ip-phone-7921g-support-for-sip-early/td-p/1987949
Cisco Unified Wireless IP Phone 7921G support for SIP early? Yes, I know CallManager Express, and it's a very good product. A customer, so far, would change only the own phones with Cisco Wireless Phones, and not the pbx.
https://community.cisco.com/t5/ip-telephony-and-phones/cisco-ip-phone-7921g/td-p/1947657
We currently have one Cisco 7921G wireless IP Phone and we would like to use it outside our corporate network. We set up our ASA5510 with phone proxy to our CUCM and the phone can register to the CUCM and gets the extension. However, there are no incoming and outgoing audio when we try to use it.
https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-wireless-ip-phone-7925g/q_a_c67-504099.html
Nov 03, 2008 · No, they are not compatible. The Cisco Unified Wireless IP Phone 7925G uses a mini-USB-B connector in order to maintain the hermitic sealing, and this connector is not compatible with the desktop charger for the Cisco Unified Wireless IP Phone 7921G.
https://www.cisco.com/c/en/us/support/collaboration-endpoints/unified-wireless-ip-phone-7925g/model.html
Oct 20, 2008 · Cisco Unified Wireless IP Phone 7921G, 7925G, 7925G-EX, and 7926G Release Notes for Firmware Release 1.4(5) Cisco Unified Wireless IP Phone 7921G, 7925G, 7925G-EX, and 7926G Release Notes for Firmware Release 1.4(5)SR1; Cisco Unified Wireless IP Phone 7921G, 7925G, 7925G-EX, and 7926G Release Notes for Firmware Release 1.4(4)
https://www.cisco.com/c/en/us/support/collaboration-endpoints/unified-ip-phone-7900-series/tsd-products-support-series-home.html
Find software and support documentation to design, install and upgrade, configure, and troubleshoot the Cisco Unified IP Phone 7900 Series.
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