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Global SIP

Global Session Initiation Protocol (SIP) unites your infrastructure and uses data networks for voice calls. Speeding up your transformation to digital voice and collaboration solutions.

Global Session Initiation Protocol (SIP) unites your infrastructure and uses data networks for voice calls. Speeding up your transformation to digital voice and collaboration solutions.

Lay foundations for cloud transformation

Lay foundations for cloud transformation

Embrace a digital alternative to traditional voice services, as you meet growing business demands.

  • Reduced costs

    Reduce costs by combining voice and data networks and removing legacy interfaces. Calls between your sites, even in different countries, are free.
  • Easy integration

    Easily integrate voice calling with your existing collaboration platforms such as Microsoft Teams, Zoom or Cisco Webex.
  • Performance reporting

    Measure, control, and optimise your service with enhanced network and voice-over-IP (VoIP) reporting.
  • Reduced costs

    Reduce costs by combining voice and data networks and removing legacy interfaces. Calls between your sites, even in different countries, are free.
  • Easy integration

    Easily integrate voice calling with your existing collaboration platforms such as Microsoft Teams, Zoom or Cisco Webex.
  • Performance reporting

    Measure, control, and optimise your service with enhanced network and voice-over-IP (VoIP) reporting.

Why choose BT for voice networks

Truly global

We provide services to customers in more than 27 countries around the world, hosting over five million users and carrying ten billion minutes annually.

Secure and compliant

We build end-to-end security into all our solutions. Our 3,000 security experts protect governments, critical national infrastructure and global corporations from more than 6,500 daily cyber attacks.

Oustanding network quality

We are constantly monitoring voice quality and proactively resolving faults, giving your people a brilliant calling experience.

Truly global

We provide services to customers in more than 27 countries around the world, hosting over five million users and carrying ten billion minutes annually.

Secure and compliant

We build end-to-end security into all our solutions. Our 3,000 security experts protect governments, critical national infrastructure and global corporations from more than 6,500 daily cyber attacks.

Oustanding network quality

We are constantly monitoring voice quality and proactively resolving faults, giving your people a brilliant calling experience.

Helping Kingston’s drive for students

Kingston University’s outdated technology couldn’t cope with incoming calls during busy recruitment drives – making them lose potential students. See how our IP solution transformed how people work at the university.

Helping Kingston’s drive for students

Kingston University’s outdated technology couldn’t cope with incoming calls during busy recruitment drives – making them lose potential students. See how our IP solution transformed how people work at the university.

Helping Kingston’s drive for students

Kingston University’s outdated technology couldn’t cope with incoming calls during busy recruitment drives – making them lose potential students. See how our IP solution transformed how people work at the university.

Helping Kingston’s drive for students

Kingston University’s outdated technology couldn’t cope with incoming calls during busy recruitment drives – making them lose potential students. See how our IP solution transformed how people work at the university.

The future is in the cloud

Find out how Global SIP can get you closer to the cloud-based future of communications.

FAQs

Session Initiation Protocol (SIP) is used to provide voice over IP (VoIP) connectivity between a Private Branch eXchange (PBX) and the Public Switched Telephone Network (PSTN). Global SIP is an alternative to Integrated Services Digital Network (ISDN30) that uses your data network to route your PSTN traffic. It can help improve organisational flexibility, offer additional resilience and operational efficiency whilst helping to reduce costs.

A SIP channel is the capacity needed to carry a single telephone call and is an attribute of both a trunk and a trunk group. The number of channels determines how big a trunk or trunk group is.

A SIP trunk is the connection to a PBX with a designated number of channels. This channel capacity is also called the trunk’s Call Admission Control (CAC).

A SIP trunk group in turn also has a designated number of channels and is a container for trunks. So trunks sit in trunk groups and multiple trunks can sit in the same trunk group. This capability is useful if you want to separate a set number of channels for your business or your contact centre.

Global SIP offers in-built resilience at no extra cost, routing calls to an alternative (stand-by) site if your primary site becomes unavailable. Some providers will charge for stand-by channels, but BT only charges for channels in use at any time.

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