Two domains and a SIP trunk

• Wikipedia says SIP trunking is how Internet telephony service providers deliver telephone services to customers with a SIP-based IP-PBX.
• The article splits the network into a private domain, connected to a PBX or unified communications server, and a public domain, toward the PSTN or PLMN.
• It says the interconnection between those domains must occur through a SIP trunk.
• Twilio's Elastic SIP Trunking docs opened, including emergency calling, codecs, and calls per second as page names.
• Telnyx's SIP trunking guide says inbound traffic and authentication use SIP connections, and outbound routing uses outbound voice profiles.

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