SIP connectivity to support inbound & outbound calling
Get all your voice calls by connecting Voiceflex SIP Trunks to Teams & keep your existing numbers.
Make and receive calls in Teams from any device; mobile, desk phone or laptop regardless of your location.
Unify your communications: video, meetings & file sharing with inbound and outbound calls in Microsoft Teams.
Invite everyone you work with to chat, meet, call, and collaborate all in one place, regardless of their location; working
from home, remote working or in the office. Use the communication and collaboration features of Microsoft Teams in
one unified platform across multiple devices; laptops, PC and mobiles. With added telephony capabilities Microsoft Teams
is a powerful unified communications & collaboration system.
Businesses can use the enriched Teams platform as a phone system because of technology; ‘Direct Routing’
Direct Routing connects Microsoft Teams to the traditional phone network (PSTN). It allows businesses to make, receive and transfer calls to and from Teams like a traditional PBX system, but without the need of having a hosted telephone application or on-premise system.
There are 2 options for dial tone in Microsoft Teams:
Direct Routing lets you retain your existing PSTN or SIP Trunks but also gives you the choice to connect Teams to a variety of telephony providers to route your inbound and outbound phone calls in Teams. By connecting to Voiceflex SIP Trunks to Teams ensure you have the reliable voice services together with improved flexibility and support.
Microsoft Calling Plans enables Microsoft Teams to be a cloud-based telephony application, tightly integrated with the rest of Teams’ functionality. However, this option can be expensive. Plus, with limited support to port numbers, this process can become tricky, unclear and time consuming.
Voiceflex was formed in 1998 with our first commercial SIP installed in 2005. We have 15 years of experience delivering SIP carrier services worldwide. Not all SIP service providers are the same; the SIP platforms, features, network topology, and commercials will differ.
One commercial route will not fit all
customers, Voiceflex provides a number
of commercial options to best meet
the needs of the customer.
Voiceflex Direct routing delivery method
is the same as your present SIP or PSTN
provider and not per user.
Get a more cost-effective option to
Microsoft Calling Plans with a number of
different commercial options to meet your
Teams may not meet all your telecommunications requirements from day one. Voiceflex simultaneously deliver calls to both Teams and your present telephony application providing the best of both worlds.
Moving to Teams does not mean you
have to lose your existing numbers. Keep
them together with any new ones.
Our dedicated provisioning team will look
after the process making it hassle free.
Bring together your internal and
external communications; phone calls,
video, chat, file sharing, screen
sharing and email into one unified
PSTN and ISDN services will be turned off in 2025, all businesses will have to move to a SIP Trunk based telephone application or hosted telephone application.
Voiceflex is one of the leading providers
of SIP services in the UK, providing
connectivity for customers around the
By default, we turn on fraud detection
for all services. Providing timely response
and notification to fraud attempts.
Direct Routing works by connecting Microsoft Teams to the PSTN by using a Session Border Controller and SIP Trunks.
A Session Border Controller is essentially a firewall. They’re used as a border between different networks to make sure data is transferred correctly. They also provide a layer of security and protection from attacks. We host a Microsoft-Certified SBC which is connected to our SIP Trunks allowing users to make and receive calls using Microsoft Teams. Voiceflex is manufacture approved by all telephone applications sold in the UK, the difference with Direct Routing is, no carrier is approved by Microsoft, it’s the SBC which needs to be approved by Microsoft.
A SIP Trunk connects your telephony application to the PSTN network. It is a facility provided by Voiceflex since 2005 that allows the routing of telephone calls an Internet connection rather than using an ISDN line, which provides more flexibility, is more efficient and more cost-effective.