{"id":200,"date":"2026-09-05T11:30:00","date_gmt":"2026-09-05T10:30:00","guid":{"rendered":"https:\/\/www.it-communicationsltd.co.uk\/articles\/?p=200"},"modified":"2026-09-01T21:07:18","modified_gmt":"2026-09-01T20:07:18","slug":"requirements-microsoft-teams-external-calling","status":"publish","type":"post","link":"https:\/\/www.it-communicationsltd.co.uk\/articles\/requirements-microsoft-teams-external-calling\/","title":{"rendered":"What Does a Business Need Before Enabling External Calling in Microsoft Teams?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">External calling in Microsoft Teams requires more than enabling a telephone icon. The business needs a suitable Teams Phone licence, a PSTN connectivity method, numbers, voice policies, network readiness, supported devices and an operational support plan.<\/p>\n<h2 class=\"wp-block-heading\">Define users and call journeys<\/h2>\n<p class=\"wp-block-paragraph\">Identify who needs external calling, a DDI, queue membership, auto-attendant access or specialist features. Map main numbers, departments, opening hours, emergency arrangements and outbound caller identification.<\/p>\n<h2 class=\"wp-block-heading\">Confirm licensing<\/h2>\n<p class=\"wp-block-paragraph\">Microsoft&#8217;s licensing varies by base subscription and function. Direct Routing users currently require Teams and Teams Phone, with other licences potentially needed for audio conferencing, contact-centre or advanced capabilities. Check the tenant rather than relying on an old quote.<\/p>\n<h2 class=\"wp-block-heading\">Choose PSTN connectivity<\/h2>\n<p class=\"wp-block-paragraph\">Options can include Microsoft Calling Plans, Operator Connect, Teams Phone Mobile and Direct Routing. The choice affects carrier control, numbers, routing, SBC responsibility and support.<\/p>\n<p class=\"wp-block-paragraph\">A managed <a href=\"https:\/\/www.it-communicationsltd.co.uk\/microsoft-teams\/\">Microsoft Teams Direct Routing<\/a> service may suit businesses needing a chosen UK provider, existing numbers or more complex integration.<\/p>\n<h2 class=\"wp-block-heading\">Prepare domains, identity and policies<\/h2>\n<p class=\"wp-block-paragraph\">Users must be correctly created, licensed and assigned voice policies. Direct Routing needs an appropriate verified domain for the SBC. Use role-based administration and protect privileged accounts.<\/p>\n<h2 class=\"wp-block-heading\">Plan numbers and porting<\/h2>\n<p class=\"wp-block-paragraph\">Inventory main numbers, DDIs and ranges. Define assignments and call queues before porting. Validate losing-provider records and associated services. Do not cancel numbers before migration.<\/p>\n<h2 class=\"wp-block-heading\">Assess the network<\/h2>\n<p class=\"wp-block-paragraph\">Review each office and remote-working pattern for bandwidth, latency, jitter, packet loss, Wi-Fi and firewall requirements. A suitable <a href=\"https:\/\/www.it-communicationsltd.co.uk\/business-broadband\/\">business broadband service<\/a> is part of voice quality, but the LAN and endpoint still matter.<\/p>\n<h2 class=\"wp-block-heading\">Select devices and headsets<\/h2>\n<p class=\"wp-block-paragraph\">Test Teams-certified headsets, room devices or phones with representative users. Consider reception, common areas, accessibility and home workers. Standardising approved equipment can simplify support.<\/p>\n<h2 class=\"wp-block-heading\">Configure emergency calling and security<\/h2>\n<p class=\"wp-block-paragraph\">Document location and emergency-call handling for offices and remote users. Apply current Microsoft and provider guidance. Review recording, retention, access and privacy requirements before enabling features.<\/p>\n<h2 class=\"wp-block-heading\">Test complete call flows<\/h2>\n<p class=\"wp-block-paragraph\">Use test numbers before porting. Verify inbound and outbound calls, caller ID, queues, auto attendants, transfers, voicemail, DTMF, emergency arrangements and failure routing. Capture examples for faults.<\/p>\n<h2 class=\"wp-block-heading\">Agree ongoing ownership<\/h2>\n<p class=\"wp-block-paragraph\">Decide who manages Microsoft licences, Teams policies, the SBC, PSTN service, numbers, devices and network. Define joiner, mover and leaver procedures and an escalation path that spans supplier boundaries.<\/p>\n<h2 class=\"wp-block-heading\">Readiness checklist<\/h2>\n<ul class=\"wp-block-list\"><li>Approved user and call-flow requirements.<\/li><li>Validated licences and PSTN option.<\/li><li>Number inventory and porting plan.<\/li><li>Network and firewall assessment.<\/li><li>Approved endpoints and support model.<\/li><li>Test, migration and continuity plan.<\/li><\/ul>\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.it-communicationsltd.co.uk\/contact-us\/\">Ask our UK team to review your Teams Phone readiness<\/a> before assigning live business numbers.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical readiness checklist for enabling external PSTN calling in Microsoft Teams safely and reliably.<\/p>\n","protected":false},"author":1,"featured_media":148,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,10],"tags":[],"class_list":["post-200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-business-voip","category-microsoft-teams"],"_links":{"self":[{"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/posts\/200","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/comments?post=200"}],"version-history":[{"count":1,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/posts\/200\/revisions"}],"predecessor-version":[{"id":248,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/posts\/200\/revisions\/248"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/media\/148"}],"wp:attachment":[{"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/media?parent=200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/categories?post=200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.it-communicationsltd.co.uk\/articles\/wp-json\/wp\/v2\/tags?post=200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}