Dial plans and routing

One page pulled from the Canon rooms named in the source column. Open the room before you quote a number in a design. This is not a copy of a Cisco document.

Check	What the room says	Source
What is the default extension length?	4 digits, and the allowed range is 2–10. [cite:1]	T2-R03-dial-plans-pstn-routing.html
What three PSTN choices can a location have?	Cisco PSTN, Cloud Connected PSTN, or premises-based PSTN. [cite:2]	T2-R03-dial-plans-pstn-routing.html
Who can place a call through cloud PSTN?	Webex Calling users. Premises-originated calls cannot. [cite:2]	T2-R03-dial-plans-pstn-routing.html
What is an ESN?	Location routing prefix plus extension, used when inter-location extension dialing is disabled. [cite:1]	T2-R03-dial-plans-pstn-routing.html
How many trunks can a route group hold?	1 to 10. [cite:2]	T2-R03-dial-plans-pstn-routing.html
What does priority level 1 on two trunks mean?	Calls are distributed randomly across them. Trunk 3 at level 2 is the fallback when a level-1 trunk is unavailable. [cite:2]	T2-R03-dial-plans-pstn-routing.html
Where may ! appear?	Once, at the end, and only on an E.164 pattern. [cite:2]	T2-R03-dial-plans-pstn-routing.html

Check

What the room says

Source

What is the default extension length?

4 digits, and the allowed range is 2–10. [cite:1]