SIP Trunking is a component of Voice over IP (VoIP) telephony which connects the IP based telephony system with the Public Telephone Network (PSTN). When used in conjunction with Microsoft Teams and Phone System this allows you to make and receive telephone calls between your Teams account and a landline or mobile phone.

To use Spitfire SIP Trunks with Microsoft Teams you first of all need a subscription that includes Microsoft Phone System and Direct Routing enabled. Spitfire SIP Trunks for Microsoft Teams include the Session Border Controller (SBC) necessary to connect non-Microsoft SIP services to Microsoft Teams.

Once configured you simply make and receive calls via your Microsoft application or compatible handset.

By using Spitfire SIP Trunks and a Spitfire circuit you can also benefit from assured call quality. This is made possible as the SBC is deployed on our network, not hosted on the public internet. By routing the audio stream directly to the PSTN and bypassing the public internet completely we can control network performance and offer assured call quality.

Spitfire SIP Trunks for Microsoft Teams give you the benefit of assured call quality that cannot be achieved using Microsoft’s own PSTN connectivity. You also only pay for the number of SIP channels you need without buying a call bundle for each and every user.

So if you want to assure call quality for your Microsoft Teams Phone System or simply want controllable call costs, Spitfire’s SIP Trunks for Microsoft Teams are for you.

Spitfire is one of the leading suppliers of SIP trunks and hosted telephony solutions in the UK. We are a licensed telephone operator running our own voice and date core network and have been providing SIP solutions for over 10 years.

Our ability to provide our own SIP trunks, voice quality connectivity and a Session Border Controller within our own network ensure high call quality at all times while keeping costs low.

Spitfire own our SIP network and host our SBC and can therefore assure call quality when using Spitfire Ethernet or Voice Approved broadband circuits.

We operate two geographically diverse SIP core network nodes offering outbound resilience and failover

The SIP Trunk and SBC are delivered as a single service, managed end-to-end by Spitfire

Keep your existing phone numbers or take new geographical and non-geographical numbers.

Network level features such as call diversion services are also available.