1. Create a SIP trunk to the loop ip address 127.0.0.1:5060
2. Create an outgoing rule, for example, for outgoing calls with the 00 prefix.
3. Create a 3CX CFD (Call flow designer) voice application that will receive an incoming call and process it instantly.
4. Set CDF Call script number as default route for SIP loop trunk.
5. Call 00{NUM}

NB. Please note that when making an outgoing call, the employee will usually receive a SIP 200 OK response instead of the 183 Session progress (early media).

NB. You will need a large license for 3CX.

Cases that can be solved using this life hack

• DNCR-based filtering of outgoing calls (do not call registry)
• Complex routing of outgoing calls based on data from an external CRM system
• Solving the task of dialing a subscriber by going through several numbers
• Blacklist of phone numbers for outgoing calls