Knowledgebase and FAQs - VOIPo

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SIP
Session Initiation Protocol. Voice over IP uses SIP to communicate call information between an end user, VoIP proxies, and upstream providers.

Softphone
Software that allows you to make and receive phone calls using your computer and your internet connection.

SPI
Stateful Packet Inspection. A process some routers and firewalls use to keep track of traffic. Sometimes SPI will block or redirect traffic, causing issues for services such as Voice over IP.