http://msdn.microsoft.com/library/en-us/tapi/tapi3/telephony_application_programming_interfaces.asp contains documentation and specification
http://www.i-b-a-m.de/Andreas_Marschall%27s_Toto_Tools.htm is a collection of free, mostly TAPI related tools
At http://www.exceletel.com you will find the well regarded and long running TeleTools series of developer tools along with related products, TeleTools and TAPI support resources, and access to both email and phone support, consulting, and development resources.
We are providing Telecom Solution from last 10 years. We are giving all the telecom solution with all the branded PBX.
We provide best TAPI solution. We have wide range telephonic software products e.g. PC Console, SoftPhone, Call Accounting, Voice Mail, IVR Solutions, Fax Server, Analog/Digital Recording,Meet Me Conference amd many more...
Please visit our web link for more information http://www.gaytescorp.com or for technical querys please mail to ketanjadhav@gaytescorp.com.