This keeps PSTN usage down as well as reduces toll fees, in addition to allowing for more advanced functionalities such as video. In multi-cluster organizations, it is usually a good practice to keep calls between end-users of different systems “on-net,” rather than using the PSTN. Global Dial Plan Replication (GDPR) and Intercluster Lookup Service (ILS) In the past few weeks, however, the Stack8 team came across two customers who do utilize these functionalities to simplify their dial plan – we hope more organizations will follow their footsteps after reading this blog post. Although these features have been around since CUCM 10.0, we have yet to see many organizations taking advantage of these new enhancements. +1-51), and phone systems need to know how to handle this type of numbers.Īll of these factors have contributed to the creation of new features within CUCM to help businesses simplify their enterprise dial plans. E.164 numbers are now officially recognized globally as the standard for phone number representations (ex.Companies are now more geographically distributed, which often implies the need for many distributed phone systems to all be linked together to form a global unified communications footprint.Phone systems are now more centralized, often supporting users in multiple geographies within the same environment.In recent years, enterprise dial plans have grown more complex, due to the changing nature of technology and the evolving realities of today’s businesses: This is usually achieved by defining an explicit Translation Pattern in CUCM for each DID (ex. In such a case, incoming PSTN call routing rules are a bit more complex: one routing rule must be defined for each DID, mapping each of them to an internal directory number. As such, it is not rare to see dial plans where users’ internal directory numbers do not match any digits from their assigned DIDs – we dub this as “non-matching DIDs” in this post. Other users would need be reached by calling the main office number, before being transferred to the right internal extension by way of a receptionist or automated attendant. In geographies where DID numbers are more expensive, only a select group of users, usually executives, receive DIDs. 555-123-XXXX matches Directory Numbers XXXX). In this scenario, incoming PSTN call routing is simple: a single rule in the ingress PSTN voice gateway allows for the translation of a whole DID block to its matching internal directory numbers, (ex. As such, a user with DID 55 would have the 4567 directory number. In many cases, to simplify the assignment of internal and external numbers, UC engineers would use the last digits of the DID as the internal extension. Users would also get assigned with an externally reachable phone number (aka DID, or Direct Inward Dial). Each user would get assigned with an internal extension (aka Directory Number), usually 4 to 6 digits long. Traditionally, enterprise dial plans for organizations running Cisco Unified Communications Manager (CUCM) were structured in a simple fashion.
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