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DialPhone

Wholesale VoIP Termination

DialPhone provides carrier-grade wholesale voice termination — A-Z routing with a focus on the United States and Canada — for carriers, ITSPs, call centers, and resellers that move volume.

US & Canada Wholesale VoIP Coverage

  • United States & Canada — domestic termination across the NANP, with local and toll-free routing.
  • A-Z international — global termination reach for international voice traffic.

Carrier-Grade VoIP Capabilities

  • SIP and multi-PBX compatible — interconnect with standard SIP trunks and common PBX platforms.
  • Scalable routing — least-cost and quality routing that grows with your traffic.
  • Carrier-grade infrastructure — built for sustained wholesale volume and reliability.
  • Monitoring & support — traffic visibility and a route-quality feedback loop.

How wholesale termination works

A wholesale partner hands outbound call traffic to the carrier over a SIP interconnect. The carrier then selects a route to the destination network and delivers the call, billing per minute against a destination rate deck. The same call can take very different paths — a direct interconnect, a tier-1 transit, or a cheaper grey route — and those paths differ sharply in audio quality, answer rate, and caller-ID handling. Choosing the right route per destination is the entire job of a wholesale voice network.

Voice-quality metrics that matter

Four standard KPIs tell you whether a route is healthy. Watch them per destination, not just in aggregate:

MetricWhat it measuresWhy it matters
ASR (Answer-Seizure Ratio)Share of call attempts that are answeredA sudden ASR drop signals a route problem or carrier blocking
ACD (Average Call Duration)Mean length of connected callsVery short ACD suggests false answers or early drops
PDD (Post-Dial Delay)Time from dialing to ringbackHigh PDD frustrates callers; under ~4 seconds is the target
NER (Network Effectiveness Ratio)Completion excluding caller behaviour (busy/no-answer)Isolates network quality from how recipients behave

Least-cost vs. quality routing

Least-cost routing (LCR) always picks the cheapest available path, which maximizes margin but can sacrifice answer rates and caller-ID delivery. Quality (or CLI-verified) routing favors direct, attested paths that preserve the calling number and connect reliably — at a higher per-minute rate. Most serious senders blend the two: quality routes for customer-facing and CLI-sensitive traffic, least-cost for tolerant, high-volume campaigns.

How wholesale pricing works

Wholesale voice is billed per minute against a destination rate deck, with a defined billing increment — commonly 1/1 (per-second) or 6/6 (six-second) rounding. Increments matter at scale: 60/60 rounding on short calls can inflate a bill well above the headline rate. Premium routes carry higher rates than least-cost ones, and decks are re-issued as carrier costs move, so the rate you sign is a snapshot, not a fixed price.

STIR/SHAKEN on US routes

For US-terminating traffic, STIR/SHAKEN attestation travels with the call and increasingly governs whether it rings clean or lands as "Spam Likely." Wholesale routes that preserve attestation protect answer rates; routes that strip or downgrade it depress them. International traffic sits outside the US FCC mandate and is handled per interconnect agreement.

Who Uses Wholesale VoIP Termination

  • Carriers and interconnect partners needing A-Z termination.
  • ITSPs and resellers reselling voice minutes.
  • Contact centers and BPOs running high outbound volume.

Wholesale vs. the DialPhone business phone product

This wholesale service is separate from the DialPhone AI business phone system — our per-seat, AI-powered cloud phone, SMS, and contact-center product for teams in the US and Canada. Wholesale termination is a carrier-facing voice service; the business phone product is for end-user organizations. They share the DialPhone network but are bought and priced differently.

Get Wholesale VoIP Rates & Rate Decks

Wholesale routing, rate decks, and interconnects are quoted per partner. Send us your volume, destinations, and routing requirements — we'll respond with a rate deck within 1 business day.

Get Rate Deck →

Or call sales: +1 (608) 795-3733

Wholesale VoIP FAQ

What is A-Z wholesale VoIP termination?

A-Z termination is a wholesale voice service that routes outbound calls to any destination worldwide — "A to Z" means the full range of country and destination codes. A carrier or reseller hands traffic to DialPhone over SIP, and DialPhone delivers each call to the destination network, billing per minute against a rate deck.

How is wholesale VoIP termination priced?

Per minute, against a destination rate deck, with a defined billing increment (commonly 1/1 or 6/6 seconds). Rates vary by destination and route quality — premium CLI-verified routes cost more than least-cost routes. Rate decks are quoted per partner based on volume and the destinations you send.

What voice-quality metrics matter in wholesale routing?

The core four are Answer-Seizure Ratio (ASR), Average Call Duration (ACD), Post-Dial Delay (PDD), and Network Effectiveness Ratio (NER).

Healthy routes show an ASR that is stable for the destination, low PDD (typically under about 4 seconds to connect), and an ACD consistent with real conversations rather than early drops or false answers.

Does wholesale termination support STIR/SHAKEN?

For US traffic, STIR/SHAKEN attestation is part of the call path — see our [STIR/SHAKEN](/glossary/stir-shaken) glossary entry. Proper attestation protects answer rates on domestic routes. International traffic falls outside the US FCC mandate and is handled per interconnect agreement.

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