Portfolio Communications has recently added some new carriers for dialer and enhanced call center solutions.  We can now offer dialer decks domestically and internationally with industry leading rates.  There is nothing fancy about SIP in regards to dialer applications… a lot of carriers have gone away from dialer solutions due to customer abuse or simply them just not being prepared for dialer traffic.  If you are looking for a carrier that is geared for dialer campaigns,  please email or call us @ info@portfoliocom.com  855-PORT411