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Collaboration, Voice & AV · Foundational

SIP URI

A SIP address in the form sip:user@host that identifies a user, device or service, similar to an email address.

Definition

A SIP Uniform Resource Identifier contains a user part and a host part (domain or IP), optionally with port and parameters such as transport=tcp or user=phone. The sips: scheme requires TLS on each hop. Collaboration systems use URI dialing, such as alice@example.com, for video and business-to-business calls, alongside traditional directory numbers.

Example

A Webex room device dials sip:boardroom@partner.com, which Expressway routes over the internet using DNS SRV.

Exam tip

URI dialing enables B2B video; CUCM routes URIs with SIP route patterns that match the domain portion.

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