Most organizations already pay for Microsoft Teams for chat and meetings. Adding Teams Phone turns it into a full cloud business phone system, so you can retire a separate PBX, its support contract and its line rental. JJC Systems' Teams voice migration services handle the parts that usually go wrong: call flow design, number porting, emergency calling and network readiness. The result is a phone system your team can manage and callers never notice changing.
: Microsoft Teams Phone is the cloud phone system built into Microsoft Teams. People make and receive external calls from the Teams app on a computer, mobile or certified desk phone, using the same number everywhere. It replaces an on-premises or hosted PBX and works as a cloud phone system alongside Teams chat, meetings and presence, which is why it is often the simplest route to unified communications for Microsoft 365 organizations. A successful move is more than switching platforms. It starts with a readiness assessment, redesigns call flows rather than copying old ones, ports numbers with a contingency plan, and keeps the old system live until each site is confirmed working. JJC Systems also manages the Microsoft tenant, identity, network and endpoints around it, so call quality problems are traced across the whole path instead of being blamed on one part.
Most organizations don't keep an old phone system by choice. These are the four reasons it survives, and each one is fixable when you move business phone service into Teams.
Teams already handles chat, meetings and presence. A separate PBX adds its own contract, maintenance, support relationship and hardware refresh cycle on top, for calls that Teams Phone can handle.
Support costs climb and parts get scarce. The replacement quote assumes you have no alternative, because moving to the cloud feels risky.
Menus and routing were built over years by people who have since left. Changing one option becomes a support ticket with an unpredictable result, and callers keep hitting the same confusing menu.
Desk phones assume desks. Staff fall back to personal mobiles, so calls bypass the system and nothing is routed, recorded or reported.
A PBX to Teams migration is not technically hard. It fails when old call flows are copied instead of redesigned, number porting is underestimated, or network readiness is assumed. A readiness assessment removes all three risks before anything is committed. call flows are copied rather than redesigned, porting is underestimated, or network readiness is assumed
Results to expect when business voice moves into Teams, measured against your current telephony cost, support burden and user experience. We agree the baseline and targets in writing before work starts, then report against them.
Typical reduction once PBX maintenance, line rental, separate support contracts and hardware refresh are folded into Microsoft licensing.
Calls, chat, meetings and presence in one app on every device, so remote staff are no longer second-class on voice.
Existing numbers are ported, not reissued, so numbers on your website, contracts and vehicles stay correct.
Your own team updates menus, queues and routing through a managed process instead of waiting on a vendor.
Monitoring against real telemetry finds network problems from data, not from user complaints.
Call volume, wait time, abandonment and handling reports for team leaders, which most legacy systems never provided.
How to read these: the figures above are typical ranges we plan and measure against, not guarantees. In your first engagement we agree the baseline, the target and the measurement method in writing, then report against them.
From the first readiness assessment to number porting, rollout and post-launch tuning. Most organizations start with one of these three and add the others later.
We review network readiness, Teams Phone licensing, your number inventory and existing call flows before you commit to a date or a carrier.
We port numbers, configure routing, roll out devices and enable users, sequenced so nobody loses a call.
We watch call quality, report on usage and keep routing current as teams and structures change.
Each service can be scoped on its own or combined into a complete PBX to Teams migration program.
A review of network capacity, quality of service settings, licensing options, number inventory, carrier contracts and current call flows, so you know the cost, risk and timeline before committing.
We run the porting process with your carrier: paperwork, scheduling and a contingency plan if a port date slips, so published numbers never go dark.
We choose and configure how Teams reaches the phone network: Microsoft Calling Plans, or Direct Routing through a session border controller to your own carrier, based on cost, geography and existing commitments.
We rebuild routing around how people really contact you, with reception, overflow, opening hours and after-hours handling designed with the teams who answer the phones.
Teams-certified handsets, headsets, common area phones and room systems specified, procured, configured and deployed, with user guidance.
Post-launch monitoring against real call telemetry, with network fixes where problems trace back to a specific site or connection.
For organizations where numbering, emergency calling, regulation and carriers differ by country or region and each has to be handled individually.
For financial services, healthcare and public sector organizations: call recording, retention, access control and the evidence regulators and auditors ask for.
Assess first, pilot second, then cut over site by site, keeping the old system available until each site is proven.
We assess the network, inventory your numbers, review carrier contracts and document your call flows, often for the first time.
We agree the target caller experience with the people who answer the phones, and confirm the licensing and carrier approach.
Routing, queues, auto attendants, device standards and emergency calling are designed and reviewed before anything is built.
A pilot group goes first. Then numbers are ported and users cut over by site or department, with the legacy path kept until each group is confirmed working.
In the first weeks we tune queues, review call quality and analytics, and set up a change process so routing stays current.
Porting dates are the real risk in a PBX to Teams migration, not the technology. Carriers control the timeline and dates can move, so we plan cutovers with contingency and keep the legacy path live until your numbers are confirmed ported.
Who needs a Teams Phone migration, and when to call
JJC Systems is a Microsoft-focused consultancy, so voice is designed as part of the Microsoft environment you already run. A Teams calling setup has three layers, and we help you choose each one:
Teams Phone is included in some Microsoft 365 plans and available as an add-on for others. We check what you already own so you don't pay twice.
Microsoft Calling Plans, Direct Routing or Operator Connect, chosen on cost, geography and existing carrier contracts.
Teams-certified desk phones, headsets, common area phones and Teams Rooms systems that suit how each space is used.
Microsoft Entra ID, conditional access and secure sign-in for every device that makes calls.
The Teams admin center and Call Quality Dashboard, which show usage and where network problems actually are.
Where a non-Microsoft option is the better answer for a site or workload, the assessment says so.
Voice is unforgiving. A missed call is visible to a customer in a way most IT problems are not.
A move to Teams is the one realistic chance to fix routing that has frustrated callers for years. We start from how people should reach you, not from how the old menu was built.
The same engineers who manage your Microsoft tenant, identity, network and endpoints also run your voice, so call quality problems are diagnosed across the whole path.
Porting depends on the carrier and dates slip. We plan for that, and the legacy routing stays available until each group is confirmed working.
Over 40 years of field experience and 24/7 support coverage. Ask us for references and for the named engineers who will work on your migration.
A firm moved to Teams Phone across three offices, porting all numbers and rebuilding reception routing around how clients actually reach fee earners.
Different sites had different phone systems and contracts. Consolidating onto Teams removed three vendor relationships and standardized device provision.
Material for teams evaluating a move away from a legacy PBX.
Licensing options, direct routing versus calling plans, network readiness, porting timelines and the decisions to make before committing to a date.
Read moreMigration is the moment to fix routing. How to redesign queues and attendants around how callers actually behave.
Read moreNetwork, licensing, numbers, emergency calling, contracts, devices and the contingency to agree before a porting date is booked.
Read moreA voice readiness assessment covers your network, licensing, numbers and call flows, and gives you a realistic cost and timeline before you commit.
Microsoft Teams Phone is the cloud business phone system built into Microsoft Teams. It lets people make and receive external calls from the Teams app on a computer, mobile or desk phone, and it can replace a separate PBX. It also provides auto attendants, call queues, voicemail and call analytics.
Yes, for most organizations. Teams Phone handles inbound and outbound calling, auto attendants, call queues, voicemail, call transfer and use on mobile and desk phones. A readiness assessment confirms whether any specialist needs, such as fax, paging or analog devices, call for a separate approach.
Teams Phone is a VoIP service: calls travel over the internet instead of traditional phone lines. The difference is that it is built into Microsoft Teams, so calling, chat, meetings and presence sit in one app, and it connects to the regular phone network through Calling Plans, Direct Routing or Operator Connect.
Usually yes. Teams Phone is included in some Microsoft 365 plans and available as an add-on for others, and you also need a way to reach the phone network. We review what you already own before recommending anything, so you don't pay for licensing twice.
Calling Plans: Microsoft provides the numbers and minutes. Direct Routing: your own carrier connects to Teams through a session border controller. Operator Connect: a certified carrier connects to Teams directly. The right choice depends on cost, geography and existing contracts.
Often yes, through Direct Routing, where your carrier or SIP trunk connects to Teams via a session border controller. Whether it is worth keeping depends on contract terms, geography and cost, which the readiness assessment compares against Calling Plans and Operator Connect.
Yes. Numbers are ported to the new service rather than reissued, so nothing published on your website, contracts or vehicles becomes wrong. We manage the porting with the carrier, plan around date changes and keep the legacy path live until each number is confirmed ported.
It depends on the number of sites, numbers and call flows, and on the carrier's porting timelines. Assessment and design come first, then a pilot group, then cutover by site or department. The written recommendation sets the timeline, and carrier porting dates are the main variable.
It depends on users, sites, numbers, devices and whether you use Calling Plans or Direct Routing. We don't quote from a price list. After a 30-minute call we send a written recommendation with clear scope, timeline and a fixed price, and the assessment gives you a realistic cost before you commit.
Not always. Some existing devices may work, while others need replacing with Teams-certified handsets. We specify handsets, headsets, common area phones and meeting room devices based on how each space is used, and many users simply use the Teams app with a headset.
Emergency calling, including E911 in the United States, must be configured correctly for each site and user, with accurate location information, and then tested. We design and test it as part of the build and handle multi-site and international differences individually.
The readiness assessment answers that. We review bandwidth, quality of service settings and site connectivity before you commit, and after go-live we monitor call quality against real telemetry and fix network issues where they appear.
Yes. We pilot with a small group first, then cut over site by site or department by department, and keep the legacy path available until each group is confirmed working.
Yes, for organizations that need it. We design call recording, retention and access controls for financial services, healthcare and public sector requirements, and provide the evidence regulators and auditors ask for.
A working Teams Phone environment with redesigned call flows, ported numbers, deployed devices, call quality monitoring and analytics, and a change process so your own team can update routing in under a day.
Describe the situation in your own words.
