Carrier · SIP trunk selection
Shortlist the right US SIP trunk carrier for your deployment — ranked by cost, features, SLA, E911 handling, and Cisco CUBE interop.
Every carrier claims "certified Cisco interop" and "toll-grade quality." In reality, some are a dream to configure, some require 15 quirks in CUBE to work, and a few will fail over E911 if you don't force their hand. This tool ranks the common US carriers against the criteria that actually matter.
You get a top-3 ranked list with strengths, weaknesses, and the Cisco CUBE quirks (if any). We're deliberately opinionated — not a directory. If your favorite isn't listed, that's intentional.
The decision is not price per channel. It's: SLA credits that actually pay, E911 that actually routes, toll-free that actually delivers, and a NOC that actually answers. We've run production trunks on AT&T, Verizon, Lumen/CenturyLink, Intermedia, Bandwidth, Twilio, and several tier-2 resellers.
Yes. Some carriers need custom SIP profiles (P-Asserted-Identity handling, Diversion header, REFER support). Our CUBE SIP Trunk tool has presets for each.
US porting is LOA-driven; 3-6 weeks is typical for hundreds of DIDs. Toll-free moves in 3-5 business days.
Top pick: Bandwidth (strong E911, clean SIP). Runner-up: Intermedia (cost advantage). Skip: any tier-2 reseller without direct LEC handoff.
Top pick: Lumen (largest Webex Calling Cloud Connect footprint). Runner-up: Intrado/West for E911 specialty deployments.