Digits Manipulation on Cisco CUCM, Where and When to do it?

Digits manipulation on Cisco Unified Communication Manager is an important part of Dial Plan, as a voip engineer, mastering this concept is mandatory because the real requirements you meet in a deployment, today a multisite deployment is very popular for large enterprise, having different sites, means different Dial Plan at each site, the HQ site has the Directory numbers that starts with 1XXX for example and two remote sites with the directry numbers starts with 2XXX and 3XXX for example, to allow inter site dialing you plan to use 4 digits for intra-site dialing and 6 digits for inter-site dialing so that between sites, users dial a site access code followed by a site code and the destination’s on-net extension (4 digits). This means digit manipulations must be implemented, another requirement when you need to manage PSTN dialing, so the calling parties of 4 digits must be converted to an E.164 format to be conform with PSTN dial plan standards, this means also that a digit manipulation must be involved.

To be able to answer these requirements, we need to know:

First Where: at which levels on Cisco Unified Communication Manager we can do Digits Manipulations?

Route Pattern
route group at the route list details level
translation pattern
Incoming Calling/Called Party Settings on gateways, trunks (or device pools)
Calling/Called Party Transformation CSS on gateways, trunks (or device pools)
Calling Party Transformation CSS on phones (or device pools)

Second When: Which level of Digit Manipulation is appropriate to my requirement? this is the big deal.
To answer this question, you need to know two things:

-Which Concept of Digit Manipulation is a part of routing process Number Transformation?

Translation Pattern –called party transform directly influences routing decision
Route Pattern –called party transform after routing decision
Route Lists –called party transform after routing decision

-Which Concept of Digit Manipulation is independent of routing decision?

Incoming Calling/Called Party Settings on gateways, trunks (or device pools)
Calling/Called Party Transformation CSS on gateways, trunks (or device pools)
Calling Party Transformation CSS on phones (or device pools)

Published by:

Redouane MEDDANE

Redouane MEDDANE is Cisco Instructor CCSI #35458, 3xCCNP Collaboration, Security and Enterprise and he a published author of some of the most important OSPF Protocol, Security and Collaboration books in the world titled OSPF Demystified With RFC, Network Security All-in-one, and Dial Plan and Call Routing Demystified on CUCM. He is also a blogger at ipdemystify.com and writes articles about collaboration and security to demystify the most complex topics. His books are known for their technical depth and accuracy especially the OSPF Demystified With RFC book, which is considered as the best OSPF book in the world and named "One of the best OSPF ebooks of all time" by BookAuthority It gives you a hint at the ability to explain complex topics with remarkable ease. He worked as a Cisco Instructor and consultant indifferent Cisco Learning Partner and awarded twice as Cisco Distinguished Instructor Award and Cisco Security Instructor Excellence Award on 2018 and 2019, and Cisco Collaboration Instructor Excellence Award on 2020. The Distinguished Instructor Award recognizes the top 5% of Cisco's most influential CCSI's who provide the highest quality training experience and demonstrate the best overall instructor performance across multiple Cisco technologie and Instructor Excellence Award recognizes the top 25% of elite CCSIs being recognized for delivering top quality training and maintaining high customer satisfaction in their field of expertise.

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