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SPECIFICTION
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AT&T IP Flexible Reach

business.att.com

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Spec score 7.5 #9 of 27 in SIP Trunking Providers

What it is

AT&T IP Flexible Reach is a SIP trunking service for businesses using premises-based telephony equipment. It provides inbound, outbound, local, and long-distance calling while allowing an existing PBX and current voice equipment to remain in use. Voice and data share an integrated access circuit. Businesses can adjust concurrent call channels, and branch extensions can share trunks across locations. The service connects premises-based or cloud-based Microsoft Teams PBX systems to the public switched telephone network. Teams customers may provide their own certified Session Border Controller or have AT&T host and manage one. AT&T says calls use its MPLS network rather than the public internet, and on-net VoIP-to-VoIP calls within that network incur no additional charges. A web portal provides performance reports, call-detail reports, and e-ordering. Network connection requires AT&T Dedicated Internet Service or AT&T Virtual Private Network for high-speed dedicated access. Pricing is available on request.

Spec sheet

What it does
AT&T IP Flexible Reach is a SIP trunking service for businesses using existing premises-based telephony equipment, providing inbound, outbound, local, and long-distance calling.Read 9 Oct 2026 · business.att.com
Headquarters
Dallas, Texas, United StatesRead 28 Sep 2026 · business.att.com
Founded
1885Read 28 Sep 2026 · business.att.com
Branch offices
Branch office extensions can share trunks across multiple locations.Read 9 Oct 2026 · business.att.com
Call rate limit
AT&T says there is no limit on the number of calls the service can originate per second.Read 9 Oct 2026 · business.att.com
Call routing
On-net VoIP-to-VoIP calls route within AT&T’s IP network and do not incur additional charges.Read 9 Oct 2026 · business.att.com
Existing equipment
Businesses can use their current voice equipment and add SIP trunking to an existing PBX.Read 9 Oct 2026 · business.att.com
Management portal
A web-based portal provides performance reporting, call detail reporting, and e-ordering.Read 9 Oct 2026 · business.att.com
Microsoft Teams
The service integrates with premises-based or cloud-based Microsoft Teams PBX to connect to the public switched telephone network.Read 9 Oct 2026 · business.att.com
Microsoft Teams SBC
For Teams integration, customers can use their own Microsoft Teams-certified Session Border Controller or have AT&T host and manage it.Read 9 Oct 2026 · business.att.com
Network
AT&T says calls are carried on its MPLS network rather than the public internet.Read 9 Oct 2026 · business.att.com
Network access requirement
Connecting to the AT&T network requires AT&T Dedicated Internet Service or AT&T Virtual Private Network for high-speed dedicated access.Read 9 Oct 2026 · business.att.com
Sales support
AT&T lists sales assistance at 877-287-5676, Monday through Friday, 7 a.m. to 7 p.m. Central Time.Read 9 Oct 2026 · business.att.com
Scalable channels
Customers can increase or decrease concurrent call channels and pay for the number of lines they need.Read 9 Oct 2026 · business.att.com
Virtual numbers
Virtual telephone numbers can give a phone local visibility when it is outside the location’s local calling area.Read 9 Oct 2026 · business.att.com
Voice and data
The service combines voice and data over an integrated access circuit to simplify network management and optimize capacity.Read 9 Oct 2026 · business.att.com

Plans and prices

AT&T IP Flexible Reach Priced on request Pricing not listed; contact AT&T for sales information Read 9 Oct 2026 · business.att.com

Every AT&T IP Flexible Reach plan and price →

Strong points and limits

Strong points

  • Works with existing PBX equipment
  • Concurrent channels can scale with demand
  • Supports Microsoft Teams PBX integration
  • Branch offices can share trunks
  • Includes web reporting and e-ordering

Limits

  • Requires AT&T dedicated internet or VPN access
  • Pricing is available only on request
  • Service is delivered through AT&T network access

Who it suits

IP Flexible Reach suits businesses keeping premises-based telephony or PBX equipment while adding SIP trunks. It also fits organizations connecting Microsoft Teams PBX systems to the public telephone network.

Verdict

IP Flexible Reach adds SIP trunking to existing business telephony and supports Teams, branch offices, and adjustable channel counts. Organizations must arrange qualifying AT&T network access and request pricing.

Where Specifiction places it

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