SIP Trunking

SIP trunking replaces traditional phone lines — like T1s or analog POTS lines — with a virtual connection over the internet that carries voice calls into and out of your existing phone system. Instead of paying for fixed physical lines, your business pays for call channels that can be scaled up or down. ACS provides SIP trunking that connects directly to your current PBX or IP phone system, so you keep your existing hardware and numbers.

Three main reasons: cost, flexibility, and simplicity. SIP trunks typically cost 40% to 60% less than traditional phone lines, can be added or removed in minutes rather than weeks, and run on your existing internet connection rather than requiring separate physical infrastructure. For businesses still paying for T1 lines or individual POTS lines, the switch to SIP trunking almost always delivers immediate monthly savings.

SIP trunking cuts costs by eliminating per-line monthly fees, reducing long-distance rates, and letting businesses pay only for the call capacity they actually use. Businesses no longer need separate contracts for local, long-distance, and internet service. ACS clients who have replaced legacy T1 lines with SIP trunks typically see the savings show up in the first billing cycle without touching their existing phone system hardware.

SIP trunking is priced per channel — one channel equals one simultaneous call. Most providers charge $15 to $25 per channel per month, plus per-minute rates for outbound calls or a flat unlimited calling fee. Your total cost depends on how many calls your business handles at the same time, your monthly call volume, and whether you choose a metered or unlimited plan. ACS helps businesses accurately size their channel count to avoid overpaying or running short during peak hours.

Common ones to watch for include E911 service fees, number porting charges, DID (direct inward dial) number costs, overage fees for exceeding included minutes, and contract termination penalties. Before signing with any provider, ask for a full breakdown of regulatory fees and per-number charges in addition to the base rate. ACS builds SIP trunking quotes with full fee transparency so clients see the complete monthly cost before making a decision.