Symptom / Need

You have a telephone system in your company and you want incoming calls to be directed to the Wolkvox platform.

Context / Scenarios

To achieve a successful integration between your telephone system and Wolkvox, it is necessary to follow a specific technical procedure, complying with certain requirements and good practices in the configuration of connectivity and security.

Answer (Solution/Recommendation)

Wolkvox Inbound Topology

The integration follows the following structure:

1. Wolkvox Side (SIP Servers)
   • SIP servers: Manage calls.
   • Virtual Private Cloud: Secure and isolated environment.
   • Cloud Firewall Rules: Security Control.
   • Cloud Router: VPC Connectivity.

Protocols and Ports:

• TCP: 80, 443
• UDP: 5060-5061, 10000-20000

Supported codecs:

• GSM, G711, G729, G723

2. Internet connection
   • All traffic flows through the Internet connection.
3. Client Side
   • Components: Firewall and server.
   • Protocol and Ports: Same as in Wolkvox.
   • Connection: Ethernet.
4. User
   • The agent answers the call from Wolkvox.

Key Considerations:

• The necessary ports must be opened in the firewall.
• The configuration must ensure uninterrupted communication.

Technical Requirements

• Protocol: SIP.
• Supported codecs: GSM, G711, G729, G723 (GSM recommended).

Procedure for configuration and integration

1. Enable ports in the firewall:
   • TCP: 80 (HTTP), 443 (HTTPS)
   • UDP: 5060-5061 (SIP signaling), 10000-20000 (RTP voice)
2. Provide public IP to Wolkvox
   • You must share the IP from which the calls will be generated.
   • Wolkvox will provide you with its IP to configure it in your infrastructure.
3. Receive authentication credentials from the trunk
   • The configuration is certified with the implementation team.
   • ZoiPer is recommended for initial testing.
4. Testing before production setup
   • Check the audio in both directions for at least 10 minutes.
5. Ensure adequate bandwidth
   • Each call requires 150 kbps symmetrical.

Recommendations

• Avoid channel swinging in the trunk.
• Segment the telephone network.
• Apply QoS rules.
• Disable SIP-ALG or SIP-Helper on Fortinet firewalls.

Configuration link on Fortinet: https://community.fortinet.com/t5/FortiGate/Technical-Tip-Disabling-VoIP-Inspection/ta-p/194131?externalID=FD36405

By following these steps, you will achieve a stable and secure integration with Wolkvox.