topic Re: Call Destination in IP Telephony and Phones

Call Destination

yarinezra — Wed, 24 Nov 2021 14:32:22 GMT

Hello everyone, my question is (didn’t know exactly what title to write) once a user calls from one point to another which dial table is the cucm checks for best match first?

Existing DN’s > Translation Patterns > Route Patterns ? Thank you all!

Re: Call Destination

Leonardo Santana — Wed, 24 Nov 2021 14:44:30 GMT

Hi,

CUCM uses the closest-match logic to select which pattern to use.

"The dial plan entries that you may place in a partition include IP phone directory numbers, directory URIs, translation patterns, route patterns, CTI route points, and voicemail ports. As described in the section on Call Routing in Unified CM, if two or more numeric dial plan entries (directory numbers, route patterns, or so forth) overlap, Unified CM selects the entry with the closest match (most specific match) to the dialed number. In cases where two dial plan entries match the dialed pattern equally, Unified CM selects the dial plan entry that appears first in the calling search space of the device making the call. Directory URIs always have to match completely; there is no concept of partial matches for directory URIs."

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/dialplan.html#90366

Re: Call Destination

b.winter — Wed, 24 Nov 2021 14:47:43 GMT

Hi,

it's a combination of CCS and partition and dial-pattern.

Generally, there is no priority between route pattern, translation pattern, DN, ...

Simply spoken:

The calling side has a CSS assigned. This CSS determines, which partitions are "viewable".

The partitions define, which patterns are "viewable".

And depending, which pattern has the best match, this one is chosen (the chosen pattern can then belong to a RP or TP or DN, ...)

If you have 2 exactly same patterns, which both then would match best, then the order of the partition in the CSS is the prioritising factor.

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Re: Call Destination

yarinezra — Wed, 24 Nov 2021 15:53:28 GMT

So the best match depends only on the CSS of the dialing user ?

Re: Call Destination

Jaime Valencia — Wed, 24 Nov 2021 16:35:07 GMT

The best match for what you're dialing will be searched within the DNs/Patterns your CSS allows you to reach, and yes, this depends on the CALLING DN AND DEVICE as the CSS from the DN and the device are concatenated (assuming they're both set and are different).