How SIP Trunking works

SIP Trunking uses Session Initiation Protocol (SIP) to establish voice communication between an Internet Telephony Service Provider (ITSP) like nexMatrix and a company's IP-PBX. ITSPs provide VoIP communication over the Internet. They are different from ISPs (Internet Service Providers) in that voice communication is enabled with SIP, but with ISPs, only the Internet connection is provided. nexMatrix is a business VoIP provider with an expertly engineered IP network that offers greater reliability, features and functionality than the public Internet. Businesses are able to migrate to IP Communications from traditional TDM gradually, using their legacy CPE with a gateway device or all at once with an IP PBX. This flexibility allows communication between any device that is IP enabled, including SIP phones, smart phones, PDAs and computers.

Historically, voice signals traveled over physical wires but SIP Trunking makes a logical connection from one point to another through the Internet, making it possible to treat voice communication as just another application and deliver it as packets of data.

PSTN (Public Switched Telephone Network) as little time as possible because the cost of using those physical wires is much higher than the virtually free Internet.