Voice termination

Wholesale VoIP termination for carriers, ITSPs and resellers

A-Z voice termination over SIP, with CLI and non-CLI routes, secure interconnection, and per-minute rates on request. Built for carriers, VoIP providers, minute resellers, and contact centers that need to complete calls with quality and margin.

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SIPTLS · SRTPCLI · Non-CLIA-ZE.164
How a terminated call travels
  1. Your switch or SBCSends outbound traffic
  2. Rozper SIP edgeAuthenticates and screens
  3. Route selectionCLI or non-CLI per destination
  4. Destination carrierFixed or mobile network
  5. Dialed phoneCall completed

SIP interconnection, secured with TLS and SRTP

01

What is VoIP termination?

VoIP termination is the process of carrying a call that starts on an IP network to the number being dialed, landline or mobile, on the public telephone network. When you buy wholesale VoIP termination, a carrier receives your traffic over SIP and completes it at the destination, billing you per minute.

In the wholesale voice market, voice termination, call termination, and SIP termination describe the same business: a company with voice routes sells capacity to other companies, which resell it to their own customers. The quality of each route and the type of interconnection decide what you pay and how many calls get answered.

02

VoIP termination routes: CLI, non-CLI, TDM and GSM

Route type is the biggest decision when you buy voice termination. Here is how the common route types compare. Rozper offers CLI and non-CLI routes; availability varies by destination and is listed in the rate deck.

CLI route

Caller ID (CLI)
Delivers the caller's number intact
Quality
Highest answer rates (ASR)
Per-minute cost
Highest
Best for
Contact centers, collections, customer service, and retail VoIP, where the recipient needs to see who is calling

Non-CLI route

Caller ID (CLI)
Caller ID delivery not guaranteed
Quality
Good, varies by destination
Per-minute cost
Lower
Best for
High-volume traffic where caller ID does not change the outcome

TDM route

Caller ID (CLI)
Depends on the interconnect
Quality
Stable, no voice compression
Per-minute cost
Medium to high; needs physical circuits
Best for
Carriers with legacy infrastructure that interconnect over circuits

GSM route

Caller ID (CLI)
Shows the SIM's number, not the caller's
Quality
Unstable, liable to blocking by mobile operators
Per-minute cost
Low
Best for
Occasional use only; weigh the regulatory and blocking risk first

Which route should you choose?

  • Choose CLI when the person you call needs to recognize who is calling: collections, outbound sales, customer service, and calls to end users.

  • Choose non-CLI when volume is high, margins are tight, and caller ID does not affect the result.

  • Combine both with per-destination routing: CLI where the answer rate matters, non-CLI for the rest.

Want more detail on routes? Read wholesale VoIP routes explained

Route types by cost and caller ID reliabilityGSM and non-CLI routes cost less but are less likely to show the caller's number; CLI routes cost the most and deliver caller ID; TDM sits in between.Per-minute costLowerHigherCaller ID reliabilityCLINon-CLITDMGSM
03

Who uses Rozper's voice termination

  • Carriers and transit operators

    Extra routes to complete destinations with quality and redundancy.

  • VoIP service providers (ITSPs)

    A-Z voice termination for your customers' outbound traffic.

  • VoIP minute resellers

    Wholesale rates to build your own calling plans with margin.

  • Call centers and contact centers

    CLI routes for campaigns where the answer rate matters.

  • UCaaS and CPaaS platforms

    SIP interconnection to take your platform's calls to the public network.

04

How SIP termination with Rozper works

Interconnection runs over SIP, between your switch or SBC and Rozper's SIP edge. There is no need to replace equipment: we work with standard SIP platforms.

  1. 1

    Step 1

    Traffic review

    Tell us your destinations, estimated volume, and route types. We send a rate deck and terms.

  2. 2

    Step 2

    SIP interconnection

    We set up authorized IPs, number format (E.164), and codecs with your switch or SBC.

  3. 3

    Step 3

    Route testing

    You send real traffic at controlled volume and track ASR, ACD, and PDD per destination.

  4. 4

    Step 4

    Production and monitoring

    Once routes are approved, traffic goes live with real-time monitoring and alerts.

05

Call termination quality and security

Where the quality metrics fall on one call
DialAnswerHang up
PDD
ACD
  • PDD Post dial delay
  • Ringing
  • ACD Conversation

ASRcounts how many call attempts reach the answer point.

How to measure voice termination quality

ASRAnswer Seizure Ratio
Answered calls as a share of call attempts. Shows whether the route completes calls.
ACDAverage Call Duration
Average length of answered calls. An unusually short ACD can point to a route problem.
PDDPost Dial Delay
Time between dialing and the destination starting to ring. Lower is better.

Protecting your interconnection

  • Fraud detection to secure your routes
  • Anomaly detection on your traffic
  • Real-time alerts for immediate action
  • Secure SIP connections with TLS and SRTP encryption
06

How to choose a VoIP termination provider

Before you sign with any VoIP termination provider, Rozper or another carrier, ask these questions:

The full list, with 25 questions and a scorecard, is in our wholesale VoIP provider checklist

  1. 01Which route types (CLI, non-CLI, TDM) are available for each destination?
  2. 02Does the provider report ASR, ACD, and PDD per destination?
  3. 03What is the billing increment (60/60, 30/6, 6/6), and how much notice comes before a rate change?
  4. 04Which regulatory registrations does the provider hold for the destinations you will use?
  5. 05How do technical support and escalation work when a route fails?
  6. 06What fraud controls and traffic limits apply to the interconnection?
07

Wholesale VoIP termination rates

Rozper provides custom quotes rather than fixed plans: you pay for the minutes you actually complete. The rate for each destination depends on route type, volume, and billing increment.

Share your destinations and estimated volume through the form below to receive a rate deck. See how we price routes on our wholesale VoIP rates

Get the full rate deck
Example rate deck layout
DestinationRouteBilling incrementRate per minute
United StatesCLI6/6On request
United Kingdom, mobileCLI60/60On request
Mexico, mobileNon-CLI60/60On request
IndiaNon-CLI60/60On request
08

VoIP termination or wholesale voice?

Wholesale VoIP and carrier interconnection

For carriers, ITSPs, and aggregators exchanging traffic carrier to carrier.

See interconnection

Wholesale voice for resellers

For resellers, call centers, and platforms that need DIDs, SIP trunks, and voice APIs.

See wholesale voice

For a deeper look at how termination works, read wholesale VoIP termination: how it works and the wholesale voice termination guide

Terminating traffic in Brazil? Terminação VoIP no atacado (português)

Frequently Asked

Questions about VoIP termination.

What carriers and resellers ask before sending traffic to Rozper.

VoIP termination is the process of carrying a call that starts on an IP network to the number being dialed on the public telephone network, landline or mobile. In wholesale VoIP termination, a carrier sells that service per minute to other carriers, VoIP providers, resellers, and call centers, which use the routes to complete their own customers' calls.
Wholesale VoIP Inquiry

Talk to a wholesale expert.

Share your traffic volume and destinations — we'll respond with a tailored rate deck and routing plan.

  • SIP interconnection with your switch or SBC
  • CLI and non-CLI routes per destination
  • Secure SIP trunking with TLS + SRTP
  • Capacity that scales with your traffic

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Ready to send your traffic to Rozper?

CLI and non-CLI routes, secure SIP interconnection, and support from real engineers.

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