This article applies to:
Exchange 2013
PROBLEM
You use Exchange Unified Messaging for voicemail and your Skype clients are used to retreive voicemail. In between your clients and the Exchange server you have a firewall and your firewall administrator is absolutely not delighted with the idea to open the entire port range of 1025-65535 for RTP protocol, which Exchange UM uses by default to deliver the media streams. The firewall administrator requires you to narrow the range to a smaller one, let’s say 49152-59964
SOLUTION
You can set the Minimum and Maximum RTP port for your Exchange UM in the MSExchangeUM.config file. The file is located in the Exchange binary folder typically under C:\Program Files\Microsoft\Exchange Server\V15\Bin\MSExchangeUM.config
Replace the default values with your own ones and restart the Exchange UM and Exchange UM Call Router Services.
IMPORTANT: make sure you remove the trailing spaces (marked red) otherwise the Exchange Server will treat those as invalid entries and will use the default vales of 1024-65535.
For further information on protocols, ports and services used by Exchange Unified Messaging check the official Microsoft documentation under: Exchange UM Protocols, Ports and Services
He lives in Zurich, Switzerland and is a dedicated specialist, with 30 years of professional work experience in IT.
Before starting Exchangemaster GmbH he worked as a system engineer and project manager with customers of all sizes and across many industries: From small ISV startups and a NGO humanitarian organizations up to largest international corporations like Stryker, Swisscom, British Telecom and Nyrstar.
He spent his entire career delivering Microsoft based infrastructure solutions with main focus on Active Directory and Exchange. During those years, he collected a valuable work experience on 8 Exchange generations (2019, 2016, 2013, 2010, 2007, 2003, 2000 and 5.5) and has delivered services to a user base of more than 3.2 million mailboxes in on-premise, hybrid and Office 365 deployments.
Beside working on customer projects, he is a regular speaker and expert at Microsoft conferences and user groups. As a Microsoft Certified Trainer he also teaches Microsoft Official Curriculum courses to technical professionals around Europe.
For his work he has received numerous awards.
In 2005 he was the first member to be elected into the MCP Hall of Fame by Windows IT Pro Magazine readers choice (as 1 of 6 worldwide).
From 2005-2017, Dejan has been awarded by Microsoft Corporation with the yearly Microsoft Most Valuable Professional award in area of Exchange for 12 years in a row (one of approximately 100 worldwide and, at the time, the only 1 such in Switzerland).
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