What%20is%20a%20SIP%20Trunk%20Anyway?!?

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What is a SIP Trunk Anyway?!?

• Jonathan Rosenberg
• Cisco

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Is this a SIP Trunk?
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Problem Definition

• SIP Trunk is in common usage as a term and
  technology concept
• Enterprise to SP Links
• Inter-PBX connections
• General server SIP interfaces
• However, no definition of
• What it is
• What it does
• How to identify one

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Proposed Solution

• SIP Trunk is a virtual SIP entity on a server
  constrained by policy
• Typically defined to support a set of extensions
  and perform specific request processing
• Identified by a SIP URI in Route header
• Examples
• PSTN routing trunk
• IVR trunk

INVITE sip17328374233_at_1.2.3.4 Route
sippstnxcnnct_at_example.com
SIP Server
This is UA loose routing applied to servers!!