Hi. I have 9 years of experience in Open source applications like Asterisk, dialler (VICIdial/GoAutodial) and IPPBX (FreePBX/Elastix). Also I have knowledge in PRI/E1, VoIP, SIP Gateways, GSM/FXO GW etc .
I can provide you solution with CHAT option.
You can also contact me on Skype. My ID is - apctelco