Built for teams managing contact phone numbers

Contact phone numbers that actually model the real world: multiple numbers, types, consent, and DND state on one record.

Phone-number data is one of the quietest-yet-most-expensive failure modes in a CRM. Contacts carry 2 to 5 numbers each, every one with a different type, consent state, and routing rule. Strkr models the full phone surface on the contact record so dialers, messaging, and compliance stay honest.

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What this audience is actually dealing with

The pains that bring buyers here.

Phone numbers inside a CRM get modeled as a single text field on the contact record 90 percent of the time, which is the quiet reason outbound dialing, SMS campaigns, and compliance audits break more often than they should. The real-world shape of contact phone data is messier than a text field can carry. A B2B contact typically has 2 to 5 numbers: direct office line, main company line, mobile cell, personal cell they share with trusted sellers, and sometimes a secondary mobile. A B2C contact typically has 1 to 3: mobile, home, work. Each number carries a type (mobile, landline, voip, toll-free), a carrier line check result (valid, invalid, disconnected, ported), a consent state (opt-in for SMS, opt-in for marketing calls, opt-in for cold calls, DND), a locale and timezone derived from the number itself, and a last-updated timestamp. On top of that, the TCPA environment in the United States requires express consent evidence for autodialed and prerecorded calls, and the Reassigned Numbers Database (RND) exists because phone numbers get reassigned to new owners. The CRM that stores "mobile" as a single varchar field cannot carry this data honestly, which is why Marcus running compliance at a mid-market lender spends two days a quarter on phone-data cleanup instead of two hours. Strkr's phone-number model is the specific fix.

The single-field trap

One phone column cannot carry five numbers.

Most CRMs ship a phone field, a mobile phone field, and maybe a work phone field. Three fields do not cover a contact with a direct line, a main company line, a mobile cell, a personal cell, and a legacy fax. The overflow goes into notes or custom fields that never surface in the dialer. Strkr's phone surface is a list on the contact record with unlimited entries, each with its own type, consent state, and routing metadata.

E.164 normalization missing

Phone numbers stored as 555-1234 and (555) 123-4567.

The same number stored as "5551234567," "(555) 123-4567," "555.123.4567," "+1 555 123 4567," and "1-555-123-4567" creates 5 variants that dedupe logic cannot match. The international data is worse because country codes vary in format. Strkr normalizes every phone input to E.164 on write (+1 for US, country code for international) so the stored value is a single canonical representation across the tenant.

Consent state as a comment

The DND flag lives in a notes field somewhere.

TCPA, CAN-SPAM for SMS, Canada CASL, UK PECR, and jurisdiction-specific telemarketing rules require evidence that a prospect consented to be called or messaged. Most CRMs do not model consent on the phone number itself. The audit trail lives in email threads, notes fields, or a separate consent management system. Strkr's consent state is a first-class field on each phone number with the evidence (date, source, scope) retained alongside.

Line-type verification gap

The dialer autodials a landline because nobody checked.

Autodialing a landline is TCPA-safer than autodialing a mobile. Many compliance frameworks require line-type checking before an outbound call fires. Most CRMs do not run the HLR (Home Location Register) lookup or carrier line check natively. Strkr integrates a line-type verification service that stamps each phone with mobile, landline, voip, toll-free, or disconnected, with the check date retained.

DNC and RND alignment

The National Do Not Call list and the Reassigned Numbers Database.

US outbound calling touches two federal data sources: the National Do Not Call Registry (DNC) and the Reassigned Numbers Database (RND). Phone numbers get reassigned every day. A number that was Jane's mobile six months ago is now Bob's mobile, and Bob did not opt in to your SMS. Strkr integrates with DNC lookups and the RND check so the outbound-eligible flag on each phone is accurate at send time.

Multi-channel inconsistency

The number is good for SMS but not for voice.

A contact may consent to SMS marketing from the business and not to prerecorded voice calls, or vice versa. The consent model has to track per-channel. "Opt-in for everything" is almost never what actually happens on a real consent form. Strkr's consent state carries a channel grid (SMS, voice, prerecorded voice, autodialed voice, marketing email) so the outbound rules are enforced per channel on the specific number.

What the phone-number model carries

The full shape of a contact phone surface on Strkr.

Strkr models phone numbers as a list on the contact record with each entry carrying nine fields that drive dialer behavior, messaging eligibility, and compliance posture. The nine cards below walk the full model with the specific operational behavior each field drives.

Number itself

E.164-normalized on write.

The phone value stores in E.164 format regardless of input format. User types "(555) 123-4567," Strkr stores "+15551234567." User types "020 7946 0958," Strkr stores "+442079460958." Dedupe, dialer routing, and messaging all run against the canonical format. The display layer formats back to local convention based on the number's country code so the user still sees "(555) 123-4567" on the record.

Phone type

Mobile, landline, voip, toll-free, fax, main.

Each phone entry carries a type field that drives routing and compliance. Mobile numbers are TCPA-tracked. Landlines are TCPA-safer for autodial. VoIP numbers are their own class because they can appear to be either. Toll-free numbers signal main-company lines. Fax numbers (yes, still exist in regulated industries) are flagged non-voice. Main company numbers route to the IVR, not the person.

Role label

Direct, mobile, personal, home, former, assistant.

Beyond the technical type, each phone carries a role label: direct office line, personal mobile, home, former number (kept for history), assistant's line for executive contacts. The role label drives UI priority on the dialer dropdown so the AE calling the contact sees "Mobile (direct)" first and "Main company line" last. Former numbers retain for history but do not appear in dial pickers.

Carrier line-type check

HLR lookup stamps each number quarterly.

Strkr runs a carrier line-type lookup on each phone number quarterly (configurable) to verify the number is still valid, still routed to the expected carrier, still of the expected type. The check writes to a line_type_verified_at timestamp. Numbers that return invalid or disconnected flag for cleanup. The quarterly refresh catches reassigned numbers and ported numbers before the next outbound send.

Consent state per channel

SMS, voice, autodialed voice, prerecorded voice each tracked.

Consent captures as a per-channel grid: SMS marketing, SMS transactional, live-agent voice, autodialed voice, prerecorded voice, marketing voice calls. Each channel carries its own opt-in state with the evidence (consent form URL, timestamp, IP, specific language the contact agreed to). The outbound send checks the specific channel against the specific number before firing.

DND and DNC flags

Business-level DND plus national DNC registry.

Two flags gate outbound. The business-level DND flag means this contact has asked us specifically to stop calling. The DNC flag means this number is on the National Do Not Call Registry. Both check at send time. The DNC check runs against the latest DNC data refresh (weekly). A number on either list cannot route to an outbound campaign and the audit log records the suppressed send.

Timezone from number

The dialer respects local calling hours.

TCPA calling hours restrict outbound to 8am to 9pm in the recipient's local time. Strkr derives the timezone from the phone number's area code and NPA-NXX exchange, with the contact's explicit timezone taking precedence when set. The dialer refuses to fire outside the local window. The suppressed-send log records the attempt and the reason so a sales manager can see why their team cannot blast at 7am Pacific.

Reassigned Numbers Database

The RND check runs weekly.

The FCC-mandated Reassigned Numbers Database tracks phone-number reassignment events. Strkr queries the RND on a weekly schedule and flags phones that have been reassigned since the last known good date. A flagged phone requires a fresh consent capture before the next autodialed or prerecorded outbound. The TCPA safe-harbor requires the business to use the RND or lose the safe-harbor defense.

Primary and preferred

Which number the AE should actually call.

Among the 3 to 5 numbers on a contact, two flags matter: primary (the number the business considers the main one for records) and preferred (the number the contact has asked to be called on). The AE dialing the contact sees preferred first, falls back to primary. The marketing engine running an SMS campaign uses the SMS-consented number that the contact flagged preferred for SMS, which is often not the same number flagged preferred for voice.

How Strkr enforces compliance at send time

The outbound suppression logic in detail.

The phone-number model is useful only if the outbound send actually honors it. The six cards below describe the specific suppression logic Strkr runs at dialer trigger time, SMS send time, and campaign enqueue time.

Pre-send check order

Nine gates between campaign button and dial tone.

When an outbound campaign fires, each phone number passes through nine gates before the dial or SMS actually sends. Business-level DND, DNC registry, RND reassignment flag, channel-specific consent, timezone calling hours, line-type validity, carrier verification freshness, duplicate-send cooldown, and tenant-level pause flag. Any gate failing writes a suppressed-send row with the specific gate name retained for audit.

Audit evidence capture

The compliance log that defends against TCPA claims.

Every outbound call and SMS writes an audit record with the pre-send check results, the consent snapshot used at send, the operator who initiated the campaign, the timestamp, the recipient number in E.164, and the suppression state. The log retains for 4 years to cover the TCPA statute of limitations. A plaintiff attorney who serves a records request gets a defensible audit trail instead of a vendor-side black box.

Suppression dashboard

The daily look at what did not send and why.

A compliance dashboard shows the daily suppression counts by reason: 42 SMS blocked for channel-consent missing, 18 calls blocked for DNC, 7 calls blocked for timezone, 3 calls blocked for RND reassignment flag. The dashboard tells the compliance officer where the consent capture pipeline is leaking and lets them intervene on the specific list hygiene problem.

Consent capture form

The language that produces defensible consent.

Strkr ships prebuilt consent capture forms with language reviewed against the current TCPA, CTIA SMS guidelines, and major state-level additions (California, Washington, Oregon, Florida). The business embeds the form on their website, lead-capture landing page, or in-store signup flow. The form writes the consent snapshot directly to the contact record with the specific language, the IP, the timestamp, and the submitted phone number.

Preference-center flow

The contact can update their own consent.

Every outbound SMS and email includes a preference-center link that lets the recipient update their own channel consent. The preference center carries SMS marketing, SMS transactional, voice marketing, voice sales, email marketing, email transactional. The recipient toggles the specific channels they want and the update writes back to the contact record immediately. STOP replies to SMS also flip the SMS consent instantly.

Carrier passthrough transparency

Carrier fees are itemized on the invoice.

Messaging rates include a Strkr-side price per message and a passthrough carrier fee that varies by country, line type, and content classification. Strkr invoices itemize the carrier passthrough separately from the Strkr messaging rate so the business sees exactly what is going to the underlying provider versus what is Strkr's markup. The passthrough rates refresh monthly as the carrier reprices.

How teams use the phone-number model day-to-day

Dialer, SMS, enrichment, and cleanup.

The phone-number model drives four daily workflows: outbound dialing with the right number, SMS campaigns to the SMS-consented numbers, enrichment that writes new numbers correctly, and quarterly list hygiene. The seven cards below walk each workflow.

Outbound dialer

The AE sees the preferred number first.

An AE clicks the dial button on a contact and sees a dropdown of all phone numbers ranked by preferred, primary, mobile role, direct role, then main company line. Each entry shows the type, the last-contact date, and the consent flags. The dialer only presents numbers the AE is authorized to call (consent, DNC, DND, timezone all green). Numbers blocked for compliance reasons display with the specific reason inline so the AE understands why.

SMS campaign send

The campaign routes to the SMS-consented number.

A marketing SMS campaign fires against the audience. For each contact, Strkr identifies the phone with SMS consent and the preferred-for-SMS flag. If multiple numbers have SMS consent, the preferred wins. If no number has SMS consent, the contact is suppressed with the reason logged. The send happens over the native messaging surface with the business-level outbound number as the sender.

Enrichment auto-write

New phones write to the correct role slot.

Enrichment data (from ZoomInfo, Apollo, Clay, Clearbit, or Strkr's own enrichment layer) returns phone numbers with vendor-side type metadata. Strkr maps the vendor type to the role label (direct, mobile, personal) and writes to a new slot on the phone list instead of overwriting the existing primary. Dupe detection runs against the E.164 normalized value so a reformatted version does not become a second entry.

Quarterly line-type refresh

The HLR lookup catches reassignments and ports.

Every 90 days Strkr runs a line-type refresh across the tenant's active contact phones. Numbers that returned mobile three months ago and return voip today flag for review. Numbers that returned valid three months ago and return disconnected flag for retirement. The refresh writes line_type_verified_at timestamps and the compliance officer reviews the flagged list on a monthly cadence.

Deduplication logic

Same number on two contacts triggers a merge review.

When the same E.164-normalized number appears on two contact records, Strkr fires a dedupe-review task. The reviewer sees both contacts side by side with the number's role on each, the activity history, and the overlap signals. A merge consolidates the contact records with the phone number appearing on the resulting record with the appropriate role label. The dedupe logic prevents the slow drift of a tenant into 15 percent duplicate contact records.

Record access logging

Who saw this phone number and when.

Reading a phone number logs an access event with the user ID, timestamp, and context (dialer, SMS send, enrichment, export). The access log retains for 24 months and surfaces on the contact's audit view. State-level privacy laws (California CCPA, Washington MHMD, Virginia VCDPA) require data-access tracking and the phone number is specifically PII under most frameworks.

Export redaction

Phone exports respect user permission scope.

A CSV export of contacts includes phone data based on the exporting user's permission scope. A rep exporting their own book sees full phone numbers. A rep exporting a cross-team report sees phone numbers only on contacts they have read permission for; other contacts show redacted values. The export log retains with the user ID and the row count so an audit can trace who exported what phone data.

Head-to-head

Strkr phone-number model vs standard CRM phone fields.

Most CRMs model phone data as a single phone field or a small set of fields on the contact record. The comparison below shows the Strkr multi-field model against a typical horizontal-CRM baseline for a team running outbound dialing and SMS campaigns.

Feature Strkr Standard CRM phone model
Numbers per contact Unlimited list with role labels Typically 2 to 3 fixed fields
E.164 normalization Enforced on write with display formatting Free-text, inconsistent formats stored
Line-type verification Quarterly HLR lookup native Third-party add-on or absent
Consent per channel SMS, voice, autodial, prerecorded each tracked Often single opt-in boolean
DNC registry check Weekly refresh with send-time gate Varies, often absent
RND reassignment check Weekly RND query with flag workflow Rarely implemented
Timezone from number Derived from NPA-NXX with override Usually tied to contact address only
STOP reply handling Instant SMS consent flip Manual process or absent
Preference center Native per-channel self-service External tool or custom build
Audit log retention 4-year TCPA-aligned retention Varies by vendor
How teams use Strkr

How teams run contact phone data on Strkr.

The playbooks below describe specific motions customer tenants run against the phone-number model. Each one anchors on a specific compliance or operational outcome.

Mid-market lender

TCPA audit cleared in two days instead of three weeks.

A mid-market consumer lender serving a TCPA records request completed the response in two days on Strkr. The audit log pulled every outbound call and SMS to the plaintiff's phone number with the pre-send check results, consent snapshot, and operator identification retained. Previously, on a legacy CRM with phone data in a varchar field, the equivalent response was a three-week archeology project with incomplete evidence that cost the firm roughly 400K in settlement value because the records could not clearly show opt-in.

240-rep outbound SDR team

List hygiene found 11 percent of phones disconnected or reassigned.

A 240-rep outbound SDR organization ran the quarterly line-type refresh across 180,000 contact phones in their tenant. The refresh flagged 11 percent as disconnected, reassigned, or line-type-changed since the prior refresh. The compliance team retired 8,400 phones from active calling and triggered fresh consent capture for 11,400 potentially-reassigned numbers. The outbound deliverability rate improved roughly 15 percent after the hygiene pass because reps stopped dialing dead numbers.

Multi-state real-estate team

Timezone enforcement prevented a six-figure TCPA settlement.

A multi-state real-estate operation running outbound SMS and calls across Pacific, Mountain, Central, and Eastern timezones had been firing at 7:30 Pacific (which was 10:30 Eastern, within the window) and inadvertently reaching Eastern-timezone recipients at 10:30 Pacific (which was 1:30 Eastern, outside the window). Strkr's number-derived timezone enforcement caught the issue at migration. The pre-existing exposure was estimated at 180K in potential TCPA claims; post-migration the outbound-outside-window count went to zero.

Insurance brokerage, 85 agents

Preference center cut DND escalations by 70 percent.

An 85-agent insurance brokerage shipped the Strkr preference center to their customer base with the first email campaign post-migration. 23 percent of recipients updated their channel preferences in the first 30 days. The DND escalation volume (customers complaining they were still being contacted after asking to stop) dropped roughly 70 percent in the following quarter because the preference-center flow gave customers granular control.

B2B SaaS, 60 AEs

Preferred-number logic improved connect rate 18 percent.

A 60-AE B2B SaaS team enriched their contact database with Clay and ZoomInfo output flowing into Strkr's phone-number model with role labels mapped from the vendor type data. The dialer presented preferred-mobile first on every contact. Connect rate on outbound dials improved 18 percent in the first month compared to the prior setup where reps dialed the main company number by default. The AE-productive-call metric correspondingly improved.

A contact phone model that carries consent, type, and compliance on every number.

Start a 14-day trial on Strkr with the phone-number model fully configured: unlimited numbers per contact, E.164 normalization, quarterly line-type verification, per-channel consent capture, DNC and RND integration, timezone-derived calling-hour enforcement, preference center, 4-year TCPA audit log retention. No carrier branding exposed. Native messaging ready.

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Common questions

What buyers in this bucket ask most.

How many phone numbers can a Strkr contact record carry?

Unlimited. The phone-number model is a list on the contact record, not a fixed set of fields. In practice, B2B contacts carry 2 to 5 phones (direct office line, main company line, mobile cell, personal cell for trusted sellers, legacy numbers kept for history) and B2C contacts carry 1 to 3 (mobile, home, work). Each phone entry carries its own type, role label, carrier line-type check, per-channel consent state, DND flag, DNC check, timezone, and preferred/primary flags. The UI displays the phones ranked by preferred and role priority. Enrichment data writes new phones to new list entries rather than overwriting existing numbers, so the full history of discovered numbers retains with the first-seen timestamp.

Does Strkr check the DNC registry and the Reassigned Numbers Database?

Yes. Strkr integrates with the National Do Not Call Registry (DNC) via the FTC-approved API with weekly data refresh and with the FCC-mandated Reassigned Numbers Database (RND) via the Somos API with weekly refresh. Every outbound call and SMS runs pre-send checks against both lists. A phone number on the DNC registry suppresses from outbound marketing campaigns with the suppression reason logged. A phone number flagged in the RND as reassigned since the last known good consent date suppresses from autodialed or prerecorded outbound with the "RND flag, fresh consent required" status, and the compliance workflow prompts the business to capture new consent before the next outbound send. The TCPA safe-harbor defense requires using the RND or losing the safe-harbor; Strkr's native integration makes the safe-harbor posture the default.

What does per-channel consent look like on a contact phone?

Each phone number on a contact record carries a channel-consent grid rather than a single opt-in boolean. The channels tracked are SMS marketing, SMS transactional, live-agent voice sales, live-agent voice service, autodialed voice, prerecorded voice marketing, and voicemail drop. Each channel has its own state (opt-in, opt-out, unknown) with the evidence captured at consent time: the consent form URL, the timestamp, the IP, the specific language the contact agreed to, the source (web form, in-store signup, phone verbal), and the operator who recorded the consent. At outbound send time, the specific channel for the specific message checks against the specific number's state. SMS marketing to a number with SMS-marketing opt-in and SMS-transactional opt-out works; SMS marketing to a number with SMS-marketing opt-out does not fire regardless of other channel states. The granularity matches what the TCPA, CTIA SMS guidelines, and state-level additions require for defensible outbound.

How does Strkr handle STOP replies to SMS?

STOP replies trigger an immediate consent flip on the specific phone number. The replying contact's SMS marketing and SMS transactional consent flip to opt-out, the DND flag sets, and the audit log records the STOP event with the exact message content, timestamp, and the specific campaign that produced the STOP. Subsequent SMS to that number suppress automatically with the suppression reason logged. Related carrier keywords (UNSUBSCRIBE, QUIT, END, CANCEL) also trigger the flip. The HELP keyword returns the business's support contact info. The STOP flip is permanent until the contact re-subscribes through a double-opt-in confirmation flow. The 24-hour window after STOP is suppression-only; any outbound SMS attempted in that window fails with the STOP suppression reason and the compliance log records the attempt.

What happens when a contact's phone number gets reassigned?

The Reassigned Numbers Database flags the number as reassigned on the next weekly RND query. Strkr sets the RND-reassigned flag on the specific phone with the reassignment date retained. Outbound autodialed and prerecorded calls to that number suppress with the "RND flag" reason until fresh consent is captured. The business workflow prompts a consent-capture motion: a direct call from an agent using live-agent dialing (which is TCPA-permissible without fresh consent on reassignment as long as the business does not know the number is reassigned, which the RND flag now establishes). If the agent reaches a new owner who declines consent, the phone retires with "declined fresh consent, reassigned" status. If the agent reaches the original contact (sometimes the RND flag is a false positive), the consent snapshot refreshes with the current date and the number returns to outbound-eligible. The whole flow is documented in the audit log for safe-harbor defense.

How does Strkr integrate with existing enrichment vendors for phone data?

Strkr integrates with the common enrichment vendors (ZoomInfo, Apollo, Clay, Clearbit, Lusha, Cognism, Rev, SalesIntel) via native connectors and open API. Enrichment data flowing in carries vendor-side metadata (phone type, confidence score, source) that maps to the Strkr phone fields. New numbers write to new list entries with the role label derived from vendor type (vendor says "mobile," Strkr labels role "mobile"; vendor says "direct," Strkr labels role "direct"). Dedupe runs on E.164 normalized value so a reformatted version of an existing number does not create a duplicate. The enrichment event logs with the vendor name, timestamp, and specific fields written so the audit view shows where each phone number came from. If a vendor returns a line-type that differs from the current Strkr check, Strkr flags for re-verification on the next quarterly refresh.

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