Thank you for contacting us on that matter.
Can you please elaborate what exactly do you mean by 'best tool for Telecom domain'? What type of tests do you plan to perform? Is it functional testing? Does you need UI testing or API testing or anything else?
Our solution - Progress Telerik Test Studio is a commercial tool, and as such it has a lot of benefits along with (that you don't get that on open tools), including 24/7 support, full browser support (any browser change or update is immediately supported by our tool), desktop WPF applications suport, Recording and Playback functionality for kick start a project and get many tests fast out of the box, coded solutions and integration with Visual Studio IDE, complex data binding support, scheduling capabilities to run tests simultaneously and distributed on multiple machines, integration with CI servers, bug tracking support, detailed results and reports. Additionally the product set includes features for Load Testing, Performance Testing, Mobile testing tool (native, hybrid and web apps for iOS and Android), API Testing, etc.
Basically you get all type of testing and full support in one tool, instead of using multiple small tools.
You can get your 30 day trial of the product with full support included and see if it works for your case as my colleague initially mentioned.
Please check our website
and online documentation
and if you have further questions, please let me know.
Hope above information was helpful,