Telnic, the registy for the .tel top level domain TLD has released APIs, toolkits, APIs, a developer forum white papers and the .tel code base. Telnic’s resources for developers will allow developers to create applications and web services around the .tel TLD.

If .tel is new to you has brief article The Google of online phone books which explains how .tel works and why .tel is different from other top level domains like .info and .mobi