Phone
SIP Trunks: flexible voice connectivity over IP.
Replace legacy phone lines with SIP trunks that connect your PBX or UC platform to the public phone network using your data connections.
Modern trunks for modern PBXs
SIP trunks let you scale channels, add numbers, and adjust routing more easily than with fixed PRI or analog lines.
Connect your phone system to the world over IP
SIP trunks use your IP network to carry calls, often lowering recurring costs and simplifying how you manage capacity across locations.
You keep your PBX or UC platform while modernizing the way voice traffic flows in and out.
SIP Trunks features
Voice over IP connectivity
Use IP connectivity instead of bundles of physical phone lines to carry calls.
Scalable channels
Increase or decrease concurrent call capacity with configuration changes, not new circuits.
Number options
Support local, toll‑free, and international numbers as your footprint grows.
Resilience features
Design trunk failover and rerouting to keep calls flowing during incidents.
Where SIP Trunks work best
Centralized PBX hubs
Feed many sites through centralized SIP trunking at core locations.
Contact centers
Combine flexible channel counts with advanced routing and reporting tools.
Global calling needs
Use local numbers and SIP trunks to build a global presence without many physical lines.
PBX / UC migrations
Use SIP trunks that can span legacy and new platforms during transitions.
How SIP Trunks connect to your PBX
SIP trunks use IP connectivity between your PBX or session border controller and the provider, replacing groups of legacy digital or analog circuits.
Call setup and teardown follow SIP standards, while media flows over IP with codec and encryption options.
Typical trunk path
IP PBX / SBC → SIP trunk over Internet/Ethernet → Provider core → PSTN & other SIP endpoints.
SIP Trunk examples
SIP is usually priced by channels, minutes, and numbers. These examples show typical groupings.
10–20 channel bundle
For small offices or single sites.
- 10–20 concurrent calls.
- Local and long‑distance options.
- Supports one PBX.
50–100 channel bundle
For larger offices or call centers.
- 50–100 concurrent calls.
- Geo‑redundant options.
- Multiple number ranges.
Burst / elastic
For variable or seasonal demand.
- Baseline channels plus burst.
- Pay‑as‑you‑grow capacity.
- Great for events or campaigns.
Business benefits of SIP Trunks
Cost efficiency
Reduce spend on fixed line bundles and long‑distance charges.
Scalability
Scale channels up or down without truck rolls or new cards.
Continuity options
Reroute calls to backup sites or numbers during outages.
SIP Trunks FAQs
Will SIP Trunks work with our existing PBX?
In many cases SIP can be integrated via native interfaces or a session border controller; compatibility is validated as part of design.
How do we size the number of channels?
Historical call volumes, concurrency, and growth expectations are analyzed to recommend a starting channel count and headroom.
Ready to modernize your trunking?
Design a SIP trunk plan around your voice platform.
Share your PBX/UC details, sites, and call patterns. Get a SIP trunk design with capacity, resilience, and migration steps.