Patton Gateway Configuration with 3CX PBX

I am looking for a freelancer who is experienced in configuring Patton Gateway with 3CX PBX. The project requires expertise in the following areas:

Patton Gateway Model: SN500
- Familiarity with the SN500 model is essential for this project.

Patton Gateway Firmware Version: 3.0
- Knowledge of the latest firmware version (3.0) is required to ensure a smooth configuration process.

Brief:
The Patton Gateway is configured successfully and reachable with 3CX with an Inbound route and received the calls. without any issue.
*the problem is only the outbound route gives errors 404-400.

we just need to solve the problem with outbound route.

3CX PBX System: 3CX Phone System
- Experience with the 3CX Phone System is necessary to integrate it with the Patton Gateway.

Key Skills and Experience:
- Proficiency in configuring Patton Gateway models, specifically the SN500.
- Expertise in working with the latest firmware version (3.0) of the Patton Gateway.
- Prior experience in integrating the 3CX Phone System with Patton Gateway.
- Strong understanding of VoIP protocols and configurations.
- Knowledge of network infrastructure and TCP/IP protocols.
- Excellent troubleshooting skills to resolve any configuration issues.

If you have the required skills and experience, please reach out to me with your proposal.