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Gradwell SIP Trunking
What Gradwell SIP Trunking is
Gradwell SIP Trunking connects a business PBX to the traditional telephone network over broadband, allowing existing phone hardware to remain in use. It offers 3CX-certified trunks, preferred supplier status, and a pre-built setup template. Direct Routing links Microsoft Teams with the traditional phone network through SIP trunks. High-volume trunks are aimed at contact centres that need high call-per-second and channel capacity, with unlimited inbound SIP and direct integration with an existing PBX. Customers can present local, non-geographical, or international numbers regardless of physical location. Number porting may take up to two weeks, depending on the transfer. Gradwell says its infrastructure runs in a resilient AWS environment across multiple carriers and that its Network Operations Centre monitors systems continuously. A dedicated UK support team is available 24/7/365. The service requires a suitable internet connection and compatible IP PBX. Pricing starts from £4/mo, while costs vary by requirements and usage.
Who it suits
This service suits businesses of different sizes using compatible PBX systems, especially 3CX or Microsoft Teams users and contact centres. It requires suitable broadband and an IP PBX supporting the needed SIP protocol.
What it does well
- Keeps existing PBX hardware in place
- Offers 3CX-certified trunks and setup template
- Connects Microsoft Teams through Direct Routing
- Supports local, international, and non-geographical numbers
- Provides 24/7/365 UK support
What to know first
- Requires a suitable internet connection
- Requires a compatible IP PBX
- Number porting can take up to two weeks
- Costs vary by requirements and usage
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| SIP Trunking | Pricing varies by requirements and usage · PAYG and bundled options available | On request |
As gradwell.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Verdict
Gradwell SIP Trunking links existing business phone systems with the traditional network, including dedicated options for 3CX, Teams, and contact centres. Its £4/mo starting price is listed, but final costs depend on usage and requirements.
Facts from Gradwell SIP Trunking's own pages
- 3CX
- Gradwell offers 3CX certified SIP trunks, preferred supplier status, and a pre-built setup template. · gradwell.com, 9 Oct 2026
- Founded
- 1998 · gradwell.com, 28 Sept 2026
- Headquarters
- Bath, United Kingdom · gradwell.com, 28 Sept 2026
- High-volume calls
- High-volume trunks target contact centres needing high call-per-second and channel capacity, with unlimited inbound SIP. · gradwell.com, 9 Oct 2026
- Intended customers
- Gradwell describes its SIP offerings for businesses of all sizes, with specialist options for 3CX users, Teams users, and contact centres. · gradwell.com, 9 Oct 2026
- Microsoft Teams
- Direct Routing connects Microsoft Teams to the traditional phone network using SIP trunks. · gradwell.com, 9 Oct 2026
- Network
- Gradwell says it owns its SIP infrastructure and deploys SIP trunks in a resilient AWS cloud environment across multiple carriers. · gradwell.com, 9 Oct 2026
- Numbering
- Customers can present local, non-geographical, or international numbers regardless of physical location. · gradwell.com, 9 Oct 2026
- Number porting
- Number porting can take up to two weeks depending on the number of numbers being transferred. · gradwell.com, 9 Oct 2026
- PBX compatibility
- The service is performance tested with major PBX vendors and high-volume trunks can integrate directly with an existing PBX. · gradwell.com, 9 Oct 2026
- Pricing limit
- The site says costs vary by requirements and usage and directs prospective customers to request a quote. · gradwell.com, 9 Oct 2026
- Requirements
- SIP trunking requires a suitable internet connection and an IP PBX compatible with the required SIP protocol. · gradwell.com, 9 Oct 2026
- Security
- Gradwell states that it is ISO 27001:2013 certified and its Network Operations Centre monitors systems 24/7. · gradwell.com, 9 Oct 2026
- Support
- Gradwell offers a dedicated UK support team 24/7/365, with customers paying for the help they need. · gradwell.com, 9 Oct 2026
- What it does
- SIP trunks connect a business PBX over broadband to the traditional phone network without replacing existing hardware. · gradwell.com, 9 Oct 2026
Where Gradwell SIP Trunking stands on Freedom251
- SIP Trunking Providers#15 of 27