Using Voice over Internet Protocol (VoIP) calling applications on your mobile phone can save you money if you make a lot of international calls or travel out of the country often. iPhone users have several options when deciding what app to download.
Offer direct white route to Viet Nam termination with competitive rate
and high quality. 100% full CLI and Non CLI; ASR: 65%;
ACD: 13 minutes; PPD: 30s and Capicity 5000 calls.