we already have team of 20 people & we provide vicidial support 24*7 .
We do dialer Installation, Configuration and also we can give you best GUI modifications (Bootstrape Theame)as per your requirements.
I worked on Dinstar Gateway, vicidial and Asterisk PBX Voice over IP. For sending limited SMS GSM gateway is enough. Where as for bulk I had other one to suggest but the number which we will sending is from USA number Lagi