cisco spa 502g сброс к заводским настройкам - SERP Analysis

https://www.3cx.ru/sip-phones/factory-reset-cisco-spa/

https://qna.habr.com/q/1313634

https://www.mango-office.ru/support/tekhnicheskaya_podderzhka/sip_oborudovanie/obshchie_voprosy_po_sip_telefonam/kak_sbrosit_do_zavodskikh_nastroek_razlichnye_modeli_ip_telefonov/

https://www.hardreset.info/ru/devices/cisco/cisco-spa-502g/faq/hard-reset/hard-reset-router/

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/csbpipp/ip_phones/eac/spa500-series/sb-spa500-series-eac-ru.pdf

https://viva-telecom.org/SHOP/FILES/CISCO/cisco_spa501_spa502_spa504_spa508_spa509-ip.pdf

https://ithelp.alliant.edu/reset-phone-to-factory-defaults.html

https://wiki.pbcras.ru/wiki/%D0%9D%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0_%D1%82%D0%B5%D0%BB%D0%B5%D1%84%D0%BE%D0%BD%D0%BE%D0%B2

https://kurgan-telecom.ru/node/295

https://www.hardreset.info/ru/devices/cisco/cisco-spa-502g/faq/factory-password/router-factory-password/