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Voice

SIP Trunking

Your phone system is not the problem. Connecting it to the outside world reliably, securely, and at reasonable cost, is the part most organizations find harder than expected.

SIP Trunking from Globalgig replaces your TDM and ISDN circuits with carrier-grade voice services over your existing IP network, eliminating fixed capacity constraints and high legacy trunking costs. You keep your existing PBX or UCaaS platform. We handle connectivity to the global telephone network, including local and international numbers, disaster recovery, and the security your compliance team needs.

If your employees use Microsoft Teams, we connect it to the PSTN through direct routing, so your users make and receive calls directly within Teams without a separate Microsoft calling plan.

Benefits

Eliminate the cost and rigidity of TDM circuits.

Keep your existing PBX. Lose the legacy connectivity.

Microsoft Teams, connected to the real world.

Global reach, local presence.

Security your compliance team can rely on.

Disaster recovery included.

Features

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Connectivity and Access

  • Carrier-grade SIP Trunking delivered over dedicated internet, MPLS VPN, Ethernet, or SD-WAN, with flexible access across public IP and private networking
  • Uncompressed G.711 voice for the highest call quality
  • Elastic capacity: Scale channels up or down without circuit provisioning delays
  • Disaster recovery and automatic failover built in as standard
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Numbers and Reach

  • Local phone numbers in markets worldwide
  • DID for individual extensions
  • International and domestic toll-free services (ITFS) for inbound calls across borders
  • Number porting from existing providers
  • Unified Communications and Collaboration (UC&C) service and seat additions
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Billing and Commercial

  • Flexible billing: Per trunk or pooled across locations
  • National and international calling plans
  • One invoice across all locations and countries
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Security and Compliance

  • SOC 2 Type II certification
  • Secure Trunking: TLS signaling and SRTP media encryption
  • STIR/SHAKEN caller authentication and robocall mitigation
  • E911 compliance
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Integration

  • Microsoft Teams direct routing
  • Compatible with a broad range of on-premises PBX equipment
  • Interoperability with leading UCaaS platforms
  • Configuration support for Asterisk, FreePBX, and other common PBX platforms

Why Globalgig

Managed, Not Self-Service

SIP Trunking service that is managed from day one, not handed over with a login. Globalgig delivers a solution tailored to your organization, managed through ongoing operations, with 24/7 support from experts who understand your setup.

One Provider for Voice and Connectivity

When your SIP Trunking and network connectivity come from the same provider, voice quality issues have one escalation path.

Global Telephony Footprint

Local numbers, DID, and ITFS across markets worldwide. We interconnect with carriers globally to optimize routing for cost and quality, based on your specific traffic profile.

Resources

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Frequently
Asked
Questions

Can we keep our existing phone numbers when switching to SIP Trunking?

Yes, existing numbers can be ported to Globalgig SIP Trunking for most markets. We manage the porting process and will confirm what is available in your specific locations before any commitment.

What is SIP Trunking and how does it replace our existing phone lines?

SIP Trunking carries voice calls over your existing internet or private network connection, replacing traditional TDM and ISDN circuits. With TDM, voice services require its own dedicated circuit separate from your data connectivity. SIP Trunking eliminates this by running voice services over your existing data connection, removing the need for a separate voice circuit. Instead of physical lines with fixed capacity, SIP trunks are virtual channels that scale with your call volume. You keep your existing PBX or phone system. The legacy circuits are replaced with a more flexible, lower-cost IP connection to the global telephone network.

How does SIP Trunking integrate with Microsoft Teams?

Through direct routing, Globalgig SIP Trunking acts as the PSTN gateway for your Teams environment, enabling your users to make and receive external calls within Teams using your own numbers. This means you do not need to buy any Microsoft calling plans on top of your existing Teams licenses.

What is the difference between per-trunk and pooled billing?

Per-trunk billing charges are based on the number of simultaneous call channels you have provisioned. Pooled billing draws from a shared pool across all your locations, which typically reduces waste, as sites with lower call volumes free up capacity for those with higher demand. We will recommend the right billing structure based on your call volumes.

What security does SIP Trunking include?

Our secure trunking option adds TLS encryption for call signaling and SRTP encryption for call media, protecting calls from interception. We use STIR/SHAKEN caller authentication to help your business meet regulatory requirements and reduce spoofing risk.

What connectivity options work with SIP Trunking?

Dedicated internet access, MPLS VPN, and Ethernet private networking are all supported. If you have Globalgig Managed SD-WAN, SIP Trunking integrates directly as part of your existing connectivity service, with voice traffic quality-of-service policies applied across your SD-WAN.

What is the difference between Hosted PBX and SIP Trunking?

SIP Trunking connects your existing on-premises PBX or UCaaS platform to the public telephone network over IP. You keep your phone system; we replace the circuits underneath. Hosted PBX is the phone system itself, delivered from the cloud, so there is no on-premises PBX hardware. Both services are available from Globalgig. Many organizations use both: SIP Trunking at sites with existing PBX hardware, and Hosted PBX at sites moving fully to cloud telephony.

Avoid the Details That Delay SIP Migrations

SIP migrations rarely fail because of the trunk itself. The risk sits in everything connected to it: numbers, call routing, emergency calling, legacy devices, failover, network readiness, and support.

Speak to a specialist about what needs to be checked, managed, and protected before, during, and after migration.