phone registration

  1. Cisco SPA504G Registration Failed Error 480 After V16 to V18 Upgrade

    Two years ago, I used the info at https://www.3cx.com/sip-phones/cisco-spa/ to successfully provision a SPA504G phone using a custom template. Subsequently this phone has worked consistently with 3CX version 16. However, after upgrading to V18, registration failed for each of the phone's four...
    • Dave Williams
    • Thread
    • cisco spa504g custom template error 480 phone registration registration failed spa504g template programming v18 ver18 version 18
    • Replies: 1
    • Forum: Other

  2. Solved Deskphones don't register upon failover from production system

    Our internal deskphones are not registering with the failover server after the failover process happens. The phones are set to register with the public DNS name of the 3CX system. The public DNS name has been put into our internal DNS structure and it resolves to the correct internal IP...
    • dashbrook
    • Thread
    • custom failover dns failover ip phone phone registration registration failed version 16
    • Replies: 5
    • Forum: Phone System / PBX

  3. Solved Phone not registering through STUN

    Hello, I am new on 3CX and had gone through the following thread link but still facing the problem with phone registration. Following are the installation details 3CX Version: 15.5.0 Server Installation Location: Google VM Number of Extensions: 20 Extension configured through STUN...
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