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Your Answer

Yes, Synway GSM gateways are interoperable with Asterisk SoftPBX which is opensource.

IP-PBX is a PBX (Private Branch Exchange) that switches calls between a traditional telephone user or between two traditional telephone users in the same way that a conventional PBX does but has the capabilities to switch calls over IP or VoIP (voice over Internet Protocol), and in most cases use Ethernet IP connections throughout the organization much in the same way that PCs connect to the LAN.

SIP stands for Session Initiation Protocol. In VoIP, it is used in the context of SIP trunking, which is a way of replacing (almost in a literal way) a phone line with the Internet

VoIP converts the sound of your voice into data and uses Internet Protocol to send that data.