Duplicate phones when using UDP port

[anonymouse]

I'm having an issue with phones being registered multiple times (showing duplicates on the phones page).

The same phone seems to be registering over and over again - it has the same MAC, IP, EXT ...etc.

This only happens when the phone transport is set to UDP - it doesn't happen when it is TCP.



I have used unique local sip port and local rtp ports (each phone increments - none of them share the same local sip/rtp ports)





Any help would be appreciated.

• Running V16 Pro Trial on Linux Debian Server hosted at DigitalOcean.
• Firewall check passes on all.
• All phones are Direct SIP (STUN-remote) on the same site (LAN).
• All phones are upgraded to the latest firmware version.
• All phones use the default 3cx templates.
• I've tried factory reset, then re-provision.
• I've tried rebooting the server and phones.
• Issue does not happen when phones use TCP as the transport.
• Issue does not happen on 3CX desktop client and mobile client.
• I've tried deleting all the extensions & phones and having only one extension with one phone - still happens.

 

[JohnS_3CX]

Hi,

You use a single static Public IP at the phones site correct?

You should check the port forwarding on the phones site, and ensure you have forwarded static ports for each device.

 

[cobaltit]

Or just use a SBC which is recommended for multiple remote phones at a single location