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TIP

You can perform a self-test for echo and DTMF functionality by dialing 07777712125552665 from any SIP Account in the CommPeak Portal.

Using this special phone number is free of charge and available to all SIP clients.

Network Options

In Network Options, you can enable STUN (Session Traversal Utilities for NAT) and TURN options, your softphone's guaranteed connection pathway.

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IMPORTANT NOTE

Only enable STUN/TURN if you're having audio issues (like one-way or missing audio). If your current setup is working fine, enabling this feature won't improve the call quality and could introduce unnecessary network steps.

These protocols actively work to bypass restrictive firewalls and NAT settings. By enabling them, you eliminate common VoIP problems like one-way audio, silent calls, and unexpected disconnects. Your CommPeak softphone becomes globally reliable, delivering clear communication without needing complicated network adjustments.

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NOTE

You can check our dedicated What are STUN and TURN in SIP? article to learn more about STUN/TURN protocols.

Enabling STUN

The STUN (Session Traversal Utilities for NAT) protocol supports call connectivity and RTP (Real-time Transport Protocol). This feature ensures reliable call connections and high-quality audio transmission across different network environments, e.g., home, office, or mobile data.

To enable the STUN protocol:

1. Slide the STUN toggle to the right.
2. In the Resolution timeout, define how long the Softphone should wait for a response from the STUN server when trying to determine its public IP and port. A typical value ranges between 1 and 3 seconds.

Enabling TURN

TURN (Traversal Using Relays around NAT) is a protocol that acts as a relay server for media traffic. It's used as a fallback when two devices cannot establish a direct peer-to-peer connection because of restrictive Network Address Translation (NAT) or firewall configurations.

To enable the TURN protocol:

1. Slide the TURN toggle to the right.
2. In the Resolution timeout, define how long the Softphone should wait for a response from the TURN server when trying to determine its public IP and port. A typical value ranges between 1 and 3 seconds.
3. If you select to use the CommPeak TURN server, slide the corresponding toggle to the right.

4. If you want to use your custom domain, leave the Use CommPeak TURN server toggle disabled and provide the necessary credentials for your own TURN server instead.

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NOTE

Please check the Why Enable STUN/TURN in CommPeak Softphone? article for more details about the benefits of enabling STUN and TURN in your Softphone app.