Kamailio VS StackRates

• Scalability
  Kamailio is known for its high scalability, able to handle thousands of call setups per second, making it suitable for large deployments.
• Flexibility
  It offers a flexible and extensible configuration language that allows customization to meet specific requirements in SIP routing and handling.
• Open Source
  Kamailio is open source software, which means no licensing costs and the ability to modify the code to tailor it to unique business needs.
• Active Community
  A large and active community supports Kamailio, providing forums, mailing lists, and regular updates, which enhances problem-solving and development.
• Multi-protocol Support
  Apart from SIP, Kamailio supports multiple protocols, including WebRTC, IPv4, IPv6, and transport layer standards like UDP, TCP, and TLS.

Possible disadvantages

• Complexity
  The flexibility and extensibility that make Kamailio powerful also lead to complexity, requiring a steep learning curve for configuration and management.
• Limited Official Documentation
  While the community is robust, some users find official documentation lacking in clarity and depth, making it hard to get started or solve intricate issues.
• Potential Overhead
  For small-scale deployments, Kamailio might be an overkill due to its architecture, which can add unnecessary overhead compared to simpler solutions.
• Professional Support
  Being open source, professional support can be limited compared to commercial solutions, although third-party services are available.
• Resource Intensive
  In some cases, especially with large-scale deployments and complex configurations, Kamailio can be resource-intensive, requiring optimization and robust hardware.

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SIP over WebSockets and Load Balancing on Kamailio

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