Is parallel dialing legal? How a parallel dialer works inside the US rules

How many lines does a parallel dialer ring, and who decides?

Every parallel dialer sets a ceiling on how many lines ring at once for one rep. On our best parallel dialers comparison, the published ceilings run from 4 (Kixie) to 10 (CloudTalk and JustCall), with Koncert at 1 to 5 depending on the plan, each read at the vendor's own site.

The ceiling matters less than who chooses the count for each wave. This is how SAGARIS does it, from the dialer documentation:

• Before each wave, the queue suggests a line count from the median pickup likelihood of the contacts about to be dialed.
• The rep sets the count, up to the workspace's line cap and never more than the contacts available, and the rep's choice wins over the suggestion.
• When a typical contact on the wave is likely to answer, the suggestion is one dedicated line, because a parallel hang-up would burn that contact. Otherwise it suggests more lines the less likely a pickup is, up to five.
• Pickup likelihood is estimated from the recipient's local hour and day and whether the number is a mobile line. It does not use call history, and a contact with no time zone on file has no estimate.
• The abandoned-call limits can hold a wave to fewer lines: three, until a campaign has enough answered calls to measure its rate.

Question to ask any vendor: who sets the line count for each wave, the rep or the software, and does the dialer hold lines back before it can measure a campaign's abandoned-call rate?

What is the 3 percent abandoned call rule?

When two people answer in the same wave and the rep can take only one, the other person is left without a rep. Under 47 CFR 64.1200(a)(7), a telemarketing call is abandoned if it is not connected to a live sales representative within two seconds of the called person's completed greeting, and a seller may abandon no more than three percent of telemarketing calls answered live by a person, measured over a 30-day period for a single calling campaign. When no representative is free within those two seconds, the rule requires a prerecorded message that says the call was for telemarketing purposes, names the business and gives a number for do-not-call requests, plus an automated opt-out the person can use before the call ends.

In a notice of proposed rulemaking adopted on 28 October 2025 (FCC 25-76), the FCC asked for comment on whether to eliminate the 3 percent abandonment rule, and on 10 November 2026 the rule still stands as written in the eCFR (up to date as of 6 November 2026).

How SAGARIS handles it, from the dialer documentation:

• An abandonment stamps a durable record on the call session. That record is the only thing counted as an abandonment, so a raw call status cannot inflate or deflate the rate.
• The required recorded message is marked pending, and undelivered, until the telephony layer confirms it played.
• The abandonment is counted against the rate. The person is not added to a suppression list.
• The rate is governed against the 3 percent cap over a rolling 30-day window. A workspace can set a stricter target, never a looser one, because the configured value is clamped down to the cap.

Question to ask any vendor: where is the abandoned-call rate shown, and can an admin set it above 3 percent?

What hours can a parallel dialer call? 8 a.m. to 9 p.m., their clock, not yours

Under 47 CFR 64.1200(c)(1), no telephone solicitation may go to a residential subscriber before 8 a.m. or after 9 p.m., local time at the called party's location. For a team dialing across US time zones, a 4 p.m. Pacific power hour is 7 p.m. Eastern, so the dialer, not the rep, has to know where each person is.

SAGARIS applies two windows, both in the called person's local time (dialer documentation):

• Business window, 09:00 to 17:00, Monday to Friday: the default for a cold contact.
• Federal ceiling, 08:00 to 21:00: the hard limit, and only a recorded federal exception crosses it. An existing customer, or a contact who asked to be contacted, can be called past 17:00, but never past 21:00.
• A call outside the window is deferred, not dropped: the contact is held in the queue with the next permitted time shown, the next 09:00 on a business day in the contact's own time zone.
• A contact whose time zone cannot be established is not called by default, because an unverifiable window is treated as a closed one. Calling such a contact needs a manager's approval.

Recording consent is resolved the same way, from where the person you are calling is. The callee's US state comes from the area code, and fifteen US states are treated as requiring all-party consent: the fourteen on the all-party list, plus Vermont, whose law is unsettled. Seven countries are on the same list.

Question to ask any vendor: what happens to a contact whose time zone is unknown?

What caller ID must a parallel dialer show?

Under 47 CFR 64.1601(e), a person or entity that telemarkets must transmit caller ID: the calling number, and the telemarketer's name when its carrier makes the name available. Blocking it is prohibited, and the number shown must let any individual make a do-not-call request during regular business hours. Tax-exempt nonprofit organizations are excused from this paragraph.

That is the legal floor. Whether the call gets answered also depends on the receiving phone company, which decides what label, if any, to show on the call. SAGARIS calls go out from a number pool dedicated to your workspace and never shared with another company, each number carries a daily dial ceiling, and the dialer walks you through registering your numbers with FreeCallerRegistry (dialer page). Three essays go deeper: why a number gets flagged as spam, what a carrier actually sees when your team dials and why a per-number dial cap has to be atomic.

Question to ask any vendor: are the numbers shared across customers, and is there a per-number daily cap?

Do the texts that follow a call need 10DLC?

If your team follows a missed call with a text, the text has its own rules. In the US, business texting from ordinary 10-digit numbers runs on 10DLC, which The Campaign Registry describes as an A2P messaging channel in which brands and their campaign service providers are verified before they are allowed to send messages. A business cannot register with The Campaign Registry directly; it registers through a messaging service provider.

How SAGARIS handles it:

• Texting stays blocked until a number reaches approved 10DLC state (SMS page).
• Registration is a guided five-step flow, not automatic: brand, campaign, number, carrier approval, renewal (SMS page).
• Texts go out only between 08:00 and 20:00 in the contact's local time (SMS page), and a time zone that cannot be resolved blocks the send rather than defaulting to permitted (channels documentation).
• A reply or STOP stops the channel it arrived on, so a plain STOP to a text opts the contact out of texts and leaves email unaffected. A Do Not Contact, a spam complaint, a hostile or legal cease, or a request to leave everything stops every channel (channels documentation).
• Suppression is keyed on the phone number and the email address rather than the contact record, so an opt-out survives the contact being edited, deleted or re-imported.

Question to ask any vendor: who registers the 10DLC brand and campaign, and does texting stay blocked until the number is approved?

The five questions in one list

• Who sets the line count for each wave, and does the dialer hold lines back before it can measure the abandoned-call rate?
• Where is the abandoned-call rate shown, and can it be set above 3 percent?
• What happens to a contact whose time zone is unknown?
• Are numbers shared across customers, and is there a per-number daily cap?
• Who registers the 10DLC brand and campaign, and is texting blocked until approval?

To see how SAGARIS answers all five, read the parallel dialer page, or set it beside ten other parallel dialers on best parallel dialers. If you are weighing AI cold calling software or a CRM with a built-in dialer, the same five questions apply. For what it costs, see pricing.

Frequently asked questions

Is parallel dialing legal?

Parallel dialing is a dialing method, and the federal telemarketing rules in 47 CFR 64.1200 regulate how it is used rather than naming it. The rules that bite are the 3 percent abandoned-call cap, the 8 a.m. to 9 p.m. calling window for telephone solicitations, caller ID under 47 CFR 64.1601(e), and the rule that calls made with an automatic telephone dialing system or a prerecorded voice to a mobile number need the called party's prior express consent (47 CFR 64.1200(a)(1)). Whether a given dialer or campaign falls under each rule is a question for your counsel; this article is not legal advice.

How does a parallel dialer work?

It rings several numbers at once for one rep and connects the rep to the first person who answers. In SAGARIS the other lines end and those contacts go back in the queue, and a line the answer detector hears as a voicemail greeting is held back from the rep.

What are the legal calling hours for sales calls in the US?

Federal rules bar telephone solicitations to residential subscribers before 8 a.m. or after 9 p.m., local time at the called party's location (47 CFR 64.1200(c)(1)). For a team dialing across time zones, the dialer has to go by where each person is, not where the rep sits.

How many lines should a parallel dialer use?

It depends on how often your list picks up. Each extra line raises the chance that two people answer together and one of them is left without a rep; SAGARIS stops at five because past that point the share of answered calls with no rep free to take them climbs faster than the extra conversations do. The parallel dialing calculator shows that trade at your own connect rate.

Does a parallel dialer need 10DLC?

The calls do not, because 10DLC is a messaging channel. The texts that follow a call need it when they are sent from ordinary 10-digit US numbers, and in SAGARIS texting stays blocked until a number reaches approved 10DLC state.

See it on your own call list

If you want to watch the line count, the calling windows and the abandoned-call record work on your own list, book a demo.