Hello, I have 10+ years of experience working for a US company as a level2/NOC voip tech, I can install, troubleshoot and customize many sip devices such as ATAs, Ip-phones, softphones and PBX systems like Asterisk/FPBX; I read all your requirements and I can build your call script according to your steps, does the script need to be perl or can be based on php ? Feel free to contact me at any time.
Thank you.