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SIP Server Differences

sipcall offers multiple SIP servers with varying characteristics. The differences between these servers are explained below.

Please note that not every customer uses the same SIP server.

note

Configure a single SIP server to avoid duplicate call signaling.

SIP Server​

In this classic configuration, the SIP endpoint directly resolves the IP address of the SIP server.

Benefits:

  • Simple configuration.
  • Supported by every SIP endpoint.

Use Cases:

  • Suitable for most use cases.
  • For systems where failover mechanisms are not necessary or possible.

Technical Background:

  • FQDN with A record

SIP Server with DNS SRV​

If your SIP endpoint supports DNS-SRV, it resolves multiple IP addresses with assigned priorities. Should the SIP server with the highest priority fail, your endpoint will automatically switch to the next SIP server.

Benefits:

  • Automatic failover in case of failures.

Use Cases:

  • Optimal for PBXs that require high availability.

Technical Background:

  • FQDN with DNS-SRV record and failover configuration
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The SIP server with DNS-SRV feature is not yet available for all products and is being rolled out gradually.

SIPS Server​

In this variant, you use our SIP servers with TLS encryption. These servers enable secure communication to the public telephone network or between your endpoint and our SIPS servers. Please note that end-to-end encryption is not possible within the public telephone network, as it does not support encryption. The encryption is limited to the internet connection between your endpoint and our SIPS servers.

Benefits:

  • Maximum protection in insecure networks through encryption of SIP messages/conversations between your endpoint and our SIPS servers.

Use Cases:

  • Recommended for security-critical applications, such as industries with strict data protection requirements.
  • Private users on public Wi-Fi networks.

Technical Background:

  • FQDN with DNS A record to the SIPS server.
  • SIPS: SIP over TLS (encrypted signaling).
  • RTP over SRTP (encrypted audio and video stream).
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The SIPS server feature is not available for all products.

Recommendation​

  • For simple systems: SIP Server
  • For particularly reliable solutions: SIP server with DNS-SRV
  • For security-critical cases: SIPS Server

These models offer flexible options to meet different requirements. Choose the configuration that best suits your needs.

Additional Resources​