--- title: Managing Multinational Network Modifications description: It's another case study episode of the WAN Manager Podcast. Today we welcome Ian Calderbank, Enterprise Network Architect at PageGroup, to the hot seat. image: https://resources.telegeography.com/hubfs/2021/Blog%20Assets/language-lab-181083_1280.jpg --- [![TG\_LOGO](https://resources.telegeography.com/hubfs/TeleGeography%20Hub%20Theme%20Nov%202025/images/TG_LOGO.svg)](https://www2.telegeography.com/) - [About](https://www2.telegeography.com/about-us) - [Research](https://www2.telegeography.com/our-research) - [Products](https://www2.telegeography.com/products) - [Solutions](https://www2.telegeography.com/solutions) - [Resources](https://resources.telegeography.com) [Log In](https://www.telegeography.com/login/login?service=https%3A%2F%2Fwww.telegeography.com%2Faccount%2Fhome%2Findex) [Contact](https://www2.telegeography.com/contact-us) ###### Data and Analysis Tools - [Cloud and WAN Research Service](https://www2.telegeography.com/cloud-and-wan-infrastructure) - [Data Center Research Service](https://www2.telegeography.com/data-center-research-service) - [GlobalComms Database](https://www2.telegeography.com/globalcomms-database-service) - [International Voice Report](https://www2.telegeography.com/telegeography-report-and-database) - [IP Networks Research Service](https://www2.telegeography.com/ip-networks-research-service) - [ISP Navigator](https://www2.telegeography.com/isp-navigatorisp-navigator) - [Transport Networks Research Service](https://www2.telegeography.com/transport-networks) - [Network Pricing Database](https://www2.telegeography.com/telegeography-pricing-database) - [WAN Cost Benchmark](https://www2.telegeography.com/wan-cost-benchmark) - [Product Passes](https://www2.telegeography.com/product-passes) ###### Consulting - [All Consulting Services](https://www2.telegeography.com/consulting) - [Submarine Cable Consulting](https://www2.telegeography.com/submarine-cable-consulting) ###### Maps - [All Map Services](https://www2.telegeography.com/map-services) - [Sponsor a Map](https://www2.telegeography.com/sponsor-a-map) - [License Map Data](https://www2.telegeography.com/license-geocoded-map-data) - [Cite a Map](https://www2.telegeography.com/cite-telegeography-map) - [Buy a Map](https://shop.telegeography.com/collections/telecom-maps/) ###### Industry - [Education](https://www2.telegeography.com/telegeography-for-education) - [Enterprise](https://www2.telegeography.com/enterprise) - [Tech](https://www2.telegeography.com/tech) - [Telecom](https://www2.telegeography.com/telecom) ###### Case Studies - [AI + Retail Telecom Data](https://www2.telegeography.com/where-to-get-global-telecom-data) - [EXA Infrastructure](https://www2.telegeography.com/exa-infrastructure-case-study) - [Orange Wholesale](https://www2.telegeography.com/orange-wholesale-case-study) - [The European Commission](https://www2.telegeography.com/the-european-commissions-data-backed-approach-to-international-policy) [Back to Resources](https://resources.telegeography.com) # Managing Multinational Network Modifications ##### By [Jayne Miller,](https://resources.telegeography.com/author/jayne-miller) Jun 14, 2021 [WAN](https://resources.telegeography.com/tag/wan) [Cloud](https://resources.telegeography.com/tag/cloud) [Podcast](https://resources.telegeography.com/tag/podcast) It's another case study episode of the podcast. Today, we welcome Ian Calderbank, Enterprise Network Architect at PageGroup, to the hot seat. In his conversation with Greg, Ian details the network transformation process for a multinational staffing agency. An environment packed with knowledge workers and downtown office space, it sounds like an enviable position to be in as a WAN manager, no? But there's no shortage of lessons learned as the pair gets into pre-SD-WAN solutions, organizing major network transitions, overlay/underlay troubleshooting, and security strategy. Subscribe to access all of our episodes: [Apple](https://podcasts.apple.com/us/podcast/the-wan-manager-podcast/id1518397175) | [Amazon](https://music.amazon.com/podcasts/706a488e-d4e8-45a9-99a4-c6e51c4a86ea/the-wan-manager-podcast) | [Spotify](https://open.spotify.com/show/74XN1NIPcb34Gv1atFMGht?si=vG3SfwaVSGawNge05Opvnw) | [Stitcher](https://www.stitcher.com/podcast/the-wan-manager-podcast) |[TuneIn](https://tunein.com/podcasts/Technology-Podcasts/The-WAN-Manager-Podcast-p1334040/) | [Podbean](https://telegeography.podbean.com/) | [RSS](https://feed.podbean.com/telegeography/feed.xml) #### Key Takeaways ### Case Study: Migration to Cloud and SaaS Applications Drove Cost Savings A major impetus for the network transformation was the company's migration of key applications, such as productivity suites like Office 365 and their recruitment management platform, to cloud and SaaS platforms. This shift meant traffic previously going to on-premises data centers now needed to go to the internet, highlighting the inadequacy of the existing centralized MPLS-based internet breakouts in terms of size and location. The opportune end of their MPLS contract term allowed PageGroup to transition to a DIA-based underlay, resulting in significant cost savings compared to their previous MPLS expenses, even when factoring in the cost of an SD-WAN overlay and services. ### Transitioning from Single MPLS to Regional Dual DIA Underlay with SD-WAN Overlay The transformation involved moving away from a network based 100% on MPLS from a single global provider. The company opted for a best-of-breed approach, selecting different regional providers for high-quality Direct Internet Access (DIA) circuits, often dual DIA at sites. This strategy was based on the understanding that quality DIA on tier-one backbones could provide MPLS-grade performance. An SD-WAN overlay was deployed on top of this DIA underlay, valued for its flexibility, agility, monitoring capabilities, and error correction features. This was integrated with a cloud internet security service that had already been implemented. ### Cloud Adoption and Remote Work are Fundamentally Reshaping the Role of the Corporate Network The increasing reliance on cloud-based applications (SaaS, Teams, Zoom) and the widespread adoption of remote work are prompting a fundamental re-evaluation of the necessity and design of the traditional corporate WAN. With core services accessible directly over the internet and users working from home on residential broadband that is often sufficient for knowledge work, the need to connect users back to a central corporate network to access applications and data is diminishing. This suggests the WAN's role may continue to evolve, potentially devolving or becoming less critical for connecting users to on-premises resources as those resources move to the cloud. ## Explore Related Content ![We Asked WAN Managers About SD-WAN + SASE](https://resources.telegeography.com/hubfs/2024/Blog%20Assets/window-2996876_1280.jpg) ###### Blog Jun 17, 2024 #### [We Asked WAN Managers About SD-WAN + SASE](https://resources.telegeography.com/sd-wan-secure-access-service-edge-trends-2023-2024) With the release of our new WAN Manager Survey intel, it was only a matter of time before we got to the... [View More by Greg Bryan](https://resources.telegeography.com/author/greg-bryan) [Read Full Article](https://resources.telegeography.com/sd-wan-secure-access-service-edge-trends-2023-2024) ![The WAN Managers Have Spoken (For Now)](https://resources.telegeography.com/hubfs/2022/Blog%20Assets/pexels-andrea-piacquadio-3760072.jpg) ###### Podcast Episode Feb 22, 2022 #### [The WAN Managers Have Spoken (For Now)](https://resources.telegeography.com/the-wan-managers-have-spoken-for-now) [Read Full Article](https://resources.telegeography.com/the-wan-managers-have-spoken-for-now) ![WAN Manager Survey Data: Let](https://resources.telegeography.com/hubfs/2021/Blog%20Assets/abstract-3226717_1280.jpg) ###### Podcast Episode Apr 19, 2021 #### [WAN Manager Survey Data: Let's Do The Time (Series) Warp](https://resources.telegeography.com/wan-manager-podcast-2020-survey-data-time-series-mpls-trends) [Read Full Article](https://resources.telegeography.com/wan-manager-podcast-2020-survey-data-time-series-mpls-trends) [![TG\_LOGO\_color\_horizontal\_SIMPLIFIED 1](https://resources.telegeography.com/hubfs/TeleGeography%20Hub%20Theme%20Nov%202025/images/TG_LOGO_color_horizontal_SIMPLIFIED%201.svg)](https://www2.telegeography.com/) [Login](https://www.telegeography.com/login/login?service=https%3A%2F%2Fwww.telegeography.com%2Faccount%2Fhome%2Findex) [Contact Us](https://www2.telegeography.com/contact-us) ###### [About](https://www2.telegeography.com/about-us) - [Research](https://www2.telegeography.com/our-research) - [Products](https://www2.telegeography.com/products) - [Solutions](https://www2.telegeography.com/solutions) - [Demo](https://www2.telegeography.com/demo) ###### [Press](https://www2.telegeography.com/telegeography-press) - [Events](https://www2.telegeography.com/telecom-events) - [Careers](https://www2.telegeography.com/careers) ###### [Resources](https://resources.telegeography.com/) - [Podcast](https://www2.telegeography.com/telegeography-explains-the-internet-podcast) - [Newsletter](https://www2.telegeography.com/subscribe-to-telegeography-emails) - - All Rights Reserved 2026 - [Privacy Policy](https://www2.telegeography.com/privacy-policy) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Jayne Miller", "url" : "https://resources.telegeography.com/author/jayne-miller" }, "dateModified" : "2026-01-31T15:00:29.364Z", "datePublished" : "2021-06-14T11:58:00.000Z", "headline" : "Managing Multinational Network Modifications", "image" : [ "https://resources.telegeography.com/hubfs/2021/Blog%20Assets/language-lab-181083_1280.jpg" ], "mainEntityOfPage" : { "@id" : "https://resources.telegeography.com/managing-multinational-network-modifications", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://resources.telegeography.com/hubfs/assets/telegeography/telegeography-logo-blog.png" }, "name" : "TeleGeography" } } ``` ```json { "@context" : "https://schema.org/", "@type" : "WebSite", "image" : "https://www2.telegeography.com/hubfs/Website/assets/logo/telegeography-logo.svg", "name" : "Managing Multinational Network Modifications", "potentialAction" : { "@type" : "SearchAction", "query-input" : "required name=search_term_string", "target" : "{search_term_string}" }, "url" : "https://resources.telegeography.com/managing-multinational-network-modifications" } ```