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SIP trunks: connecting a phone system to calling service

Updated 2026-10-30 · Prepared by Call Global Communications Inc

Short answer: A SIP trunk connects a private telephone system to a calling provider over IP. It is a connection arrangement rather than a handset or a public telephone number.

A PBX uses registration or another provider-approved authentication method to route calls. Keep routing, caller identity, codecs and access rules aligned at both ends.

Use the definition to check your setup

A SIP trunk connects a private telephone system to a calling provider over IP. It is a connection arrangement rather than a handset or a public telephone number.

A PBX uses registration or another provider-approved authentication method to route calls. Keep routing, caller identity, codecs and access rules aligned at both ends.

Where the CallGlobal line fits

Your number account provides the public telephone identity, its communication controls and the SIP credentials for compatible software. Other capabilities belong to the application or phone system you choose.

Review the live product feature list before relying on an additional function. Number porting, hosted IVR, voicemail, call recording and a public customer API are not included.

Protect the line and the account

  • Keep account and SIP passwords private, including in support screenshots.
  • Confirm the active rental term before relying on incoming communication.
  • Use the complete international number and only an authorized caller identity.

Frequently asked questions

What does this term describe?

A SIP trunk connects a private telephone system to a calling provider over IP. It is a connection arrangement rather than a handset or a public telephone number.

How does this affect practical configuration?

A PBX uses registration or another provider-approved authentication method to route calls. Keep routing, caller identity, codecs and access rules aligned at both ends.

Does every telephone concept name an included product feature?

No. A glossary explains terminology. The product feature page and your number dashboard identify the functions provided with a CallGlobal line.

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