I have two other phones currently working with the Asterisk Server. I can not register the Zyxel p-2000w WiFi. I am also getting this error on the CLI: NOTICE[277]: chan_sip.c:7691 handle_request: Registration from ‘sip:3005@10.1.0.20;user=phone’ failed for ‘10.1.4.21’
Any type of help would be greatly appreciated.