Inbound calls - SIP Trunk with Cisco CME

[nmdc.kzstan]

Hi,

Outgoing calls (From 3CX extentions to CME extensions) are working over Generic SIP Trunk (Type of Authentication -> 'Do not require - IP Based'). But incoming calls from CME are rejected with 'SIP/2.0 407 Proxy Authentication Required'.

In Generic SIP Trunk > Call Options both inbound and outbound calls are allowed by default.

3CX version 15.0.0