Troubleshooting Common Issues with Zoiper3

When using Zoiper3, you may encounter issues with connectivity or signaling. In this article, we will go over some common problems and their solutions to help you resolve them.

One of the most common issues is STUN (Session Traversal Utilities for NAT) settings not working as expected. Try different combinations of enabling or disabling STUN and rport for signaling. You may need to experiment with different settings on your WiFi access point, 3G/4G network, or VoIP server to find one that works.

Another problem is the presence of a NAT router between your softphone and the server, which can cause packets to be dropped. If you are using a jailbroken iOS device, disable any firewalls installed to resolve this issue.

If a firewall on your device is blocking traffic, check your device's settings to enable Zoiper3 to function properly. You can also consult our list of problematic routers and their solutions for additional assistance.

Some routers may intercept and modify packets as they pass through, which can cause connectivity issues. Make sure to disable SIP ALG (Application Layer Gateway) on your router to resolve this problem.

Using TLS encryption for SIP signaling is highly recommended, especially when combined with a server running SIP on port 443. This requires server-side support for TLS, so be sure to check with your ITSP (Internet Service Provider) if necessary.

Additionally, some network providers may block VoIP calls, which can prevent Zoiper3 from functioning properly. If you encounter this issue, contact your internet provider and ask if they allow VoIP calls on their network.

In rare cases, there may be an issue with your internet connectivity. Open your browser to check if you can visit a random website. If not, try troubleshooting your internet connection before proceeding.

Finally, double-check your Zoiper3 settings to ensure that the 'Host' setting is correct and does not contain any spaces. This simple step can resolve many connectivity issues.

By following these steps and experimenting with different settings combinations, you should be able to resolve most common issues with Zoiper3. If you are still experiencing problems, feel free to contact your ITSP for further assistance.