Imagine a delivery has finished, the driver has accepted another job, and the previous customer calls the temporary number again. Where should that call go? That question is more useful when choosing call masking software than a claim that a platform can hide caller ID.
For marketplace product and engineering teams, Plivo Number Masking is worth investigating for packaged session and number assignment. Twilio Proxy offers session-based voice and messaging, with a material Public Beta qualification. Infobip Number Masking and Exotel deserve attention when your application will decide whom an incoming caller should reach. Vonage Voice API provides a documented route for building a voice proxy around your own application logic.
There is no universal winner. Choose according to who maintains the pairing, when it expires, which numbers are available in your launch market, and how the complete communication is charged. This guide uses official documentation checked on November 8, 2026; we did not place test calls or benchmark these providers.
Follow the temporary number through its lifecycle
Call masking connects two people through a provider-controlled number so their personal numbers are not presented to each other. A marketplace must still know which authorized participants belong together. Hiding digits in a staff dashboard is a different capability from creating that temporary two-way telephone connection.
Consider a hypothetical home-services marketplace. A customer should reach the assigned technician during a booking, a replacement technician should receive the next authorized call, and an expired booking should lead to a defined closed-session response. The old mapping must not accidentally connect a caller to somebody else's job.
Translate those events into purchase criteria. Can the vendor allocate and release a number? Does it maintain a session, or does your backend select the destination on every call? What happens when your backend does not answer? Who can inspect the real numbers in operational records? These questions determine engineering work, incident handling and the buying decision.
| Product | Mapping responsibility | Documented lifecycle capability | Pricing context | Important qualification |
|---|---|---|---|---|
| Plivo Number Masking | Packaged session API assigns an account number | Session expiry and call time limits | Flat per-session model described; request current quote | Account enablement may be required |
| Twilio Proxy | Proxy sessions and participant-number allocation | Session state and active-duration controls | Confirm Proxy-specific charge plus applicable usage | Public Beta; no Twilio SLA for beta product |
| Infobip Number Masking | Your backend provides mapping decisions | Incoming-call action and final status callbacks | Voice pricing and number configuration require route-specific quote | Web-interface setup does not remove mapping work |
| Exotel | Your server returns the corresponding recipient | Transaction-driven bridge in documented example | Request a masking-specific commercial quote | Confirm the marketplace service, rather than UI-only masking |
| Vonage Voice API | Your application owns the proxy logic | Official examples include pair expiry | Pay-per-use Voice API; validate deployed application costs | A sample implementation needs production engineering |
Compare packaged sessions: Plivo and Twilio
Plivo Number Masking: a defined session object
Plivo's Number Masking overview describes sending both participants' real numbers to its API, which creates a session and assigns a virtual number from your account. Either party can then call that number to reach the other. The session can include multiple non-concurrent calls, configurable recordings and callbacks.
This is a useful fit when your application already knows the booking pair and you want a documented masking session rather than assembling every telephony step. Its Session API distinguishes mapping expiry from the limit on an individual call. That matters if a booking remains contactable for an hour but a single conversation should have a shorter permitted duration.
There are two purchasing cautions. The API overview lists a possible account-not-enabled error and directs customers to support. Its masking explainer describes a flat per-session pricing model, so ordinary Voice API minute prices should not be treated as the packaged masking quote. Confirm the current fee, included duration, country availability and number arrangement.
Choose Plivo when that session contract fits the booking lifecycle. Compare Infobip when you deliberately want to determine the destination through your own incoming-call callback instead. Neither approach removes the need to define authorized participants.
Twilio Proxy: plan for overlapping relationships
Twilio Proxy pairs participants through temporary voice and messaging sessions. Its session reference exposes session state and controls over how long a pairing stays active. This makes it relevant when the same transaction needs both calls and messages within one temporary relationship.
The critical commercial restriction is visible in the current documentation: Proxy remains Public Beta, and beta products are not covered by a Twilio SLA. If your procurement requirement is an SLA-backed masking product, that can disqualify this particular offering before development begins. Do not assume the wider Twilio platform's maturity overrides a specific product's status.
Pool planning also deserves attention. Twilio's number-sizing guide explains that a participant cannot use the same Proxy number in concurrently active sessions. One technician serving overlapping bookings may need several distinct proxy identifiers. Overall traffic and number reputation create further capacity considerations; daily booking count alone is a poor pool-sizing rule.
Choose Proxy when its session model and beta terms are acceptable. Compare Plivo for another packaged session model, checking its account availability and commercial conditions independently. We could not verify a current Proxy-specific public tariff, so an old per-session price from a roundup is not a buying quote.
Compare callback-driven masking: Infobip and Exotel
Infobip Number Masking: own the destination decision
Infobip's technical overview describes an incoming call triggering a callback to your platform. Your application can instruct it to play an audio response or dial an external number and bridge the call. A final status message reports the call outcome.
That creates a useful boundary for a marketplace with existing booking logic: the application decides whether contact is still authorized, and Infobip handles the selected voice action. Its setup guide explicitly requires mapping logic on your side, even if configuration is created through the web interface. Treat that work as part of the purchase.
Choose Infobip when your engineering team wants this control and can operate the callback service. Confirm timeout and failure behavior with your exact configuration. Skip it as a supposedly configuration-only solution if nobody will maintain the backend mapping. Plivo is the more relevant comparison for a packaged session abstraction.
Infobip publishes Voice pricing by direction and destination, with account and contract qualifications. Request a quote covering the masking configuration and numbers; a low inbound rate does not establish the total price of a bridged conversation.
Exotel: connect assignment logic to the bridge
Exotel's marketplace example starts when a driver or executive calls its virtual number. Exotel requests the corresponding customer's number from your server, then connects the parties through the virtual number. This is relevant to delivery or field-service businesses whose assignment system already determines the correct recipient.
The question to resolve in a demonstration is what happens after reassignment or completion. Ask the vendor to show the actual server request, the selected recipient and the response when the assignment is no longer valid. The published flow establishes a bridge; it does not establish your application's expiry policy.
Be precise about the product requested. Exotel also documents contact-center Number Masking, including contexts where masking is only visual and underlying numbers remain accessible in logs or developer tools. That is not proof that you have purchased temporary two-way marketplace calling.
Choose Exotel when this assignment-driven integration and its verified country offering fit. Compare Infobip for a similar callback ownership decision. The pricing landing page did not provide a masking-specific tariff; request the applicable quote, number charges, commitments and usage terms rather than borrowing a contact-center seat price.
Vonage Voice API: treat the proxy as an application
Vonage's masked-calling guide walks through virtual numbers, incoming-call webhooks, number mapping and connecting the call. Its separate voice-proxy example includes paired numbers and expiration through an application deployed on Vonage Cloud Runtime.
This fits a team that wants to inspect and extend the implementation. For example, a marketplace might incorporate a booking-specific grace period into its own authorization decisions. That is proposed application behavior, not a promise that a provider enables your exact rule automatically.
The trade-off is ownership. A deployable example demonstrates a possible implementation, not independently tested production capacity, an incident process or a complete support agreement. Specify who maintains state, changes expiry behavior and investigates failed bridges. If that work is outside your team's capacity, compare a packaged session product first.
Vonage's Voice pricing page describes pay-per-use billing and directs buyers to current country rates. Include the number, connected voice legs and any runtime costs in the quotation. We do not present an unverified universal masking subscription price.
Put one booking on the invoice
Ask every finalist to price the same hypothetical workload: 10,000 bookings, two completed calls per booking, and three connected minutes per call. That produces 60,000 conversation minutes. For a configuration charging both connected legs for the same duration, the corresponding volume is 120,000 leg-minutes. Confirm actual billing definitions and rounding before using that estimate.
As an illustration of the distinction, Twilio's US Voice rate page lists local inbound calling at $0.0085 per minute and outbound at $0.0140. Applying those rates to 60,000 minutes in each direction gives $1,350 in voice usage. This is component arithmetic for that assumed US route, not a Twilio Proxy quote: numbers, Proxy-specific charges, taxes and other selected services are excluded. It also does not apply to Plivo's separately described flat session model.
Request written answers for session fees, voice legs, number rental, failed or unanswered attempts, billing increments, recording retention and the minimum commitment. Record which items are included. A per-session model can be easier to budget only after the session definition and allowances match your booking pattern.
Make closure a release requirement
Use consenting test participants to create two overlapping bookings, complete one, reassign the other and call the old temporary numbers again. Capture the destination and caller ID seen at both ends, the expiry result, the operational event and the billed unit. Repeat with an unavailable callback service and an exhausted or unsuitable number pool. These are proposed acceptance checks, not tests we performed.
Keep outcomes as passed, failed or unresolved. An expiry failure should block launch even if the happy-path call works. Also inspect who can access raw participant numbers and diagnostic records; masking the displayed number does not erase the application and provider's operational data.
If your task is allocating callers to employees in a service queue, our automatic call distribution guide addresses that different purchase. For marketplace privacy, finish with a documented temporary relationship: who may communicate, for how long, through which number, and what a late caller hears. That boundary is the basis for choosing a provider and accepting the implementation.
