Looking for logging into the Grandstream Gxp2120 Web site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Grandstream Gxp2120 Web site. After that you can login as usual with your login credentials.
http://www.grandstream.com/sites/default/files/Resources/gxp21xx_14xx_usermanual_english.pdf
http://www.grandstream.com/sites/default/files/Resources/GXP2130_2140_2160_BLF_Guide.pdf
http://www.grandstream.com/support/faq/product-related-questions/gxv3140-ip-multimedia-phone/basic-installation-and-settings
http://www.grandstream.com/sites/default/files/Resources/gxp21xx_administration_guide.pdf
http://www.grandstream.com/products/ip-voice-telephony/high-end-ip-phones/product/gxp2120
https://www.voipsupply.com/downloads/dl/file/id/321/grandstream_gxp_21xx_series_user_guide.pdf
https://teamhelp.sipgate.de/hc/de/articles/203644161-BLF-auf-dem-Grandstream-GXP-2020-einrichten-
https://www.onsip.com/voip-phone-reviews/grandstream-gxp-2100
https://teamhelp.sipgate.co.uk/hc/en-gb/articles/204212051-Presence-BLF-with-Grandstream-GXP-2110-2120-and-2124-IP-Phones
https://www.3cx.com/sip-phones/grandstream-gxp/
https://sonetel.com/en/help/help-topics/sip/what-sip-phones-can-i-connect-to-sonetel/how-can-i-connect-a-greandstream-phone/
https://www.youtube.com/watch?v=7ElgpVHup_Q
https://support.starface.de/forum/showthread.php?2531-Granstream-GXP2020-und-GXP2120