I am looking for an expert to help me develop a paypercall application,once you indicate you are an expert i will discuss the project further with you.
knowledge in following fields
trixbox,piaf,asterisk API by php and freepbx,a2billing.
api of didww,callkey,paypal etc.
customization of freepbx modules like "findmefollow","voicmail","backup",
a2billing with ARI integration.