Phone System
How brand vetting works for A2P 10DLC and how to submit business details that get approved with the best possible Trust Score.
102 articles
1 min read
Campaign Verify Token for Political Toll-Free Messaging
Political election campaigns that text from a toll-free number must include a valid Campaign Verify auth token in their toll-free verification.
2 min read
Register Your A2P Campaign with the Chat Widget Setup
Use the guided chat widget flow to register your SMS campaign with a ready-made, compliant consent form.
1 min read
Error 21211: Invalid "To" Phone Number
Fix calls and texts that fail because the destination number is invalid, incomplete, or not in E.164 format.
1 min read
Error 21408: SMS Not Allowed to This Country or Region
Why texts fail when the destination country isn't enabled for your account, and how to fix the number or the region settings.
2 min read
Error 21606: "From" Number Is Not SMS Capable
Resolve texts that fail because the sending number can't send SMS, isn't active in your account, or isn't set up for that destination.
1 min read
Error 21610: Attempt to Send to Unsubscribed Recipient
Messages are blocked when a contact opted out or has Do Not Disturb on. Learn how to confirm the status and when messaging can resume.
1 min read
Error 21614: "To" Number Is Not a Valid Mobile Number
Fix texts sent to numbers that can't be validated as mobile numbers, such as landlines, incomplete numbers, or bad formatting.
1 min read
Error 21635: "To" Number Is a Landline
The number may be valid, but landlines can't receive standard SMS. Here's how to reach the contact instead.
1 min read
Error 30003: Number Unreachable or Out of Service
Texts fail when the recipient's phone is off, out of signal, or temporarily unavailable. Learn when to retry and when to update the number.
1 min read
Error 30004: Message Blocked or Recipient Opted Out
Understand why a destination number is blocked from receiving your message and what to check before sending again.
1 min read
Error 30005: Recipient Number Inactive or Does Not Exist
Fix texts to numbers that are unknown, disconnected, or entered incorrectly.
1 min read
Error 30006: Landline or Unreachable Carrier
Texts fail when the destination is a landline or the recipient's carrier can't be reached for that number type.
1 min read
Error 30008: Unknown Delivery Error
The carrier didn't give a reason for the failure. Use these steps to narrow down message length, characters, and destination issues.
1 min read
Error 30011: MMS Not Supported for This Number or Region
Picture and media messages fail when the recipient, carrier, or region doesn't support MMS. Here's what to do instead.
1 min read
Error 30023: Daily Message Cap Reached
Your registered brand hit its daily messaging limit for certain carriers. Learn how the cap works and how to plan around it.
1 min read
Error 30032: Toll-Free Number Not Verified
Toll-free numbers must be verified before they can text recipients in the US and Canada. Here's how to fix it.
1 min read
Error 30033: A2P 10DLC Campaign Suspended
Messages fail when the A2P campaign linked to your number is suspended. Learn how to review and resolve the suspension.
1 min read
Error 30035: Number Not Fully Registered for A2P
Recently approved numbers need up to 24 hours for carrier provisioning before texting works everywhere.
1 min read
Error 30037: Outbound Messaging Disabled
An account-level restriction is stopping outgoing messages. Here's how to confirm it and get it reviewed.
1 min read
Error 30453: Blocked by Carrier as a Fraud Precaution
Carrier fraud systems can temporarily block traffic to a destination that looks unusual. Learn what triggers it and how to recover.
1 min read
Error 30024: Numeric Sender ID Not Provisioned on Carrier
The destination carrier requires a registered sender that isn't fully provisioned yet. Learn the causes and fixes.
1 min read
Error 30034: Link a Phone Number to Your Approved A2P Campaign
US local numbers must be linked to an approved A2P campaign before they can text. Here's how to link one.
1 min read
Error 21612: Messaging Route Not Supported
The sending number can't reach the recipient's country or carrier. Learn how to choose a compatible sender.
1 min read
Error 30007: How to Prevent Carrier SMS Filtering
Carriers filter messages that look like spam or skip compliance steps. Follow these guidelines to keep your texts delivered.
2 min read
A2P 10DLC Brand Approval Best Practices
How brand vetting works for A2P 10DLC and how to submit business details that get approved with the best possible Trust Score.
2 min read
A2P 10DLC Campaign Approval Best Practices
A checklist for writing A2P 10DLC campaign details that reviewers can verify, so your campaign is approved the first time.
2 min read
A2P Campaign Registration: Step-by-Step Guide
Register an A2P 10DLC campaign after your brand is approved, choose a messaging use case and volume option, and submit for review.
2 min read
A2P Campaign Rejections, Required Fixes and Vetting Errors
Find out why an A2P 10DLC campaign was rejected, read the required fixes, and correct common rejection codes before resubmitting.
1 min read
A2P Opt-In Forms: Privacy Policy and Terms Guidelines
What your SMS Terms of Service and Privacy Policy must say, and how to present them on opt-in forms, for A2P compliance.
1 min read
AI-Powered A2P Compliance Validation
Use the built-in AI review to catch common opt-in and campaign compliance issues before you submit an A2P 10DLC campaign.
1 min read
Attachment Size Limits for SMS/MMS and Email
Understand file size and type limits for MMS and email attachments, and how large files are shared as links instead.
1 min read
Avoid Call Loops When Routing Calls to Internal Phone Numbers
Learn what a call loop is, why the system warns you, and how to route calls safely when you use your own numbers as forwarding destinations.
1 min read
Best Practices for Periodic Opt-Out Texts and Sender ID
Why identifying your business and repeating opt-out language matters, and how to turn periodic sender info and opt-out updates on or off.
1 min read
Best Practices for SMS Deliverability and Avoiding Restrictions
How error and opt-out rates are monitored, what happens when they're too high, and what to do if your SMS sending is warned or restricted.
1 min read
A2P Brand Registration: Step-by-Step Guide
Register your business as an A2P 10DLC brand in the Trust Center so you can text US numbers from local numbers.
1 min read
Forward Calls to Your FunnelStreams Phone Number
Forward calls from your existing cell or landline to your FunnelStreams number so calls can use Voice AI, tracking and routing.
1 min read
Call Transcriptions for Recorded Calls
Turn on call transcription so recorded calls are converted to text you can read in Conversations.
2 min read
Use Your Existing Number or Buy a New Number?
Compare verifying a number you already own for outbound calls with buying a new FunnelStreams number for full calling and texting.
1 min read
Configure SMS Compliance Settings
Set how sender identification and opt-out language are added to outbound texts, for the first message and for ongoing conversations.
1 min read
Forbidden Message Categories for SMS and MMS in the US and Canada
Learn which message types carriers prohibit for SMS and MMS, why, and what happens if prohibited content is sent.
1 min read
How RCS Registration Works
Understand the two-part RCS sender registration process and what information you need before you can send RCS messages.
1 min read
Receive Inbound Calls in the Mobile App
Set up a user so inbound business calls ring in the FunnelStreams mobile app, and fix common reasons calls don't arrive.
1 min read
Assign Phone Numbers to Users
Give a team member their own direct number, or ring several team members from one shared number.
1 min read
Create and Use Call Scripts in the Web and App Dialers
Build reusable call scripts your team can read during live calls in the web dialer and mobile app.
1 min read
How to Fix Bad Call Quality
Troubleshoot choppy audio, static, echo and dropped calls in the web dialer by checking your connection, browser, hardware and network.
1 min read
How to Purchase a Phone Number
Buy a local, mobile or toll-free number for your sub-account and set it up for calls and texts.
1 min read
How to Reduce Inbound Spam Calls
Layer Number Intelligence, dispositions, DND and IVR screening to cut down spam and nuisance calls.
1 min read
Send Inbound SMS Notifications With a Workflow
Use the Customer Replied trigger to alert your team by text or email when a contact sends an SMS.
1 min read
How to Set Up Call Tracking (Number Pool)
Show a unique tracking number to website visitors based on their traffic source, so every call is attributed to the right campaign.
1 min read
Submit and Track Port-In Number Requests
Move eligible US numbers from another carrier into your account, with an auto-generated authorization letter and status tracking.
1 min read
How to Buy a Toll-Free Number
Find and buy a toll-free number (800, 888, 877 and similar) for your sub-account.
2 min read
Create and Link a Regulatory Bundle for Australian Local Numbers
Meet Australia's Know Your Customer rules by creating an approved regulatory bundle and linking it to your Australian local numbers.
1 min read
How to Get Your Number A2P Approved: Consent Checkbox Rules
Set up form consent checkboxes the way carriers expect, whether the phone field is required or optional, so your A2P campaign is approved.
1 min read
How to Submit a Campaign for A2P 10DLC
Fill in each section of the A2P campaign details page, from use case and sample messages to consent, privacy policy and terms.
1 min read
Identity Verification for Phone Number Purchases (US, CA, PR, IL)
Why you may be asked to verify your identity when buying certain phone numbers, and how to complete it the first time.
1 min read
Improve Your Number's Reputation With Voice Integrity
Register your US numbers with Voice Integrity to remove "Spam Likely" labels and raise answer rates on outbound calls.
1 min read
Inbound Call Routing by Working Hours
Only ring a user during their scheduled working hours, and send calls outside those hours to other team members or your backup.
1 min read
Inbound Calls: IVR, AI, Routing and Call Flow Explained
See the order in which an inbound call is handled, from IVR and Voice AI to owners, team members, forwarding and backup.
1 min read
International SMS Compliance: UK and Turkey
Understand sender and registration rules for texting the UK, and the link ban for international texts to Turkey.
1 min read
KYC Verification Best Practices
Complete identity (KYC) verification ahead of time and avoid failed attempts and expired sessions.
1 min read
Know Your Customer (KYC) in the United Kingdom
What KYC details are needed for UK phone numbers, the key dates, and how to submit a Regulatory Compliance bundle.
1 min read
Phone Messaging Policy
Understand the SMS messaging policy, the difference between sending limits, compliance restrictions and contact DND, and how they affect workflows.
1 min read
A2P 10DLC Campaign Use Case Types
Choose the right A2P 10DLC campaign use case for your messages, from marketing and customer care to mixed and special use cases.
1 min read
Message Throughput and Trust Scores for A2P 10DLC
How your brand's Trust Score and campaign type set your US texting throughput (messages per second).
1 min read
Allow Microphone Access in Your Browser
Fix calls that won't connect because your browser or operating system is blocking microphone access.
1 min read
Multi-Line Dialer
Ring up to three contacts at once from a call list and get connected to whoever answers first.
1 min read
A2P Status Tags on Phone Numbers
Read the A2P tag next to each phone number to see its registration status and whether you need to act.
1 min read
Number Hosting for Hosted Messaging
Text from a number that stays with your current carrier for voice, and learn how hosting differs from porting.
1 min read
Opt-In Methods and Their Compliance Requirements
The accepted ways to collect SMS consent, from website forms to verbal and paper opt-ins, and what each must include.
1 min read
Outbound Calls With the Web Dialer
Make, manage and transfer calls from your browser with the web dialer, and fix common setup issues.
1 min read
Phone Number Configuration Options
An overview of every setting that controls how a phone number handles inbound and outbound calls.
1 min read
Phone Dialer Overview
Use the built-in dialer to place and receive calls, choose your outbound number, control audio and transfer calls.
1 min read
Phone Number Change Security Alerts and Reversal
How you're alerted when your profile phone number is added or changed, and how to reverse an unauthorized change.
1 min read
Phone Number Edit Configuration (Incoming Call Settings)
Use Edit Configuration to manage everything that routes an inbound call to a number in one place.
1 min read
Messaging Analytics Overview
Track SMS delivery, failures, opt-outs and trends for your sub-account in Messaging Analytics.
1 min read
Physical VoIP Deskphones (SIP)
Connect a compatible open-SIP deskphone so a user can make and receive business calls from a physical handset.
1 min read
Porting Options: US In-App vs International
Choose the right way to port a number into your sub-account: in-app for US numbers, or a manual request for international numbers.
1 min read
RCS Messaging
Send branded, interactive RCS messages with automatic SMS fallback, and learn what you need to get started.
1 min read
Best Practices for a Positive Caller Reputation
Keep your calls trusted and answered with SHAKEN/STIR, CNAM, Voice Integrity and good calling habits.
1 min read
Regulatory Bundles and Address Bundles for Sub-Accounts
Create the address and regulatory bundles some countries require before you can buy or use their phone numbers.
1 min read
Ring Incoming Calls to Multiple Users
Ring several team members at once when a call comes in, so the first available person can answer.
1 min read
Set Up Voicemail and Voicemail Drops
Upload company and user voicemail greetings, and record voicemail drops you can leave with one click.
1 min read
Texas Mini-TCPA Law: What You Need to Know
How Texas's amended telemarketing law affects marketing texts from September 1, 2025, who it covers and what non-exempt senders must do.
1 min read
Toll-Free Verification Guide (US/Canada)
Verify a toll-free number so it can text US and Canadian contacts, and submit details that pass review.
1 min read
Track Call Outcomes With Custom Call Dispositions
Record the outcome of each call with dispositions, create your own, and use them in workflows and reports.
1 min read
Transfer Calls to Team Members Without a Personal Number
Transfer a live call to a teammate in the web or mobile app, even if they don't have a personal phone number set.
1 min read
Troubleshooting SMS Delivery Issues
Check a text's delivery status, understand what each status means, and fix the most common delivery problems.
1 min read
Understanding Common SMS Delivery Errors
A quick reference to SMS and MMS error codes: where to find them, what they mean and what to fix.
1 min read
Understanding Inbound Call Rate Limits
How inbound call rate limits protect your numbers from abusive or automated call floods, and which limits apply to IVR, Voice AI and regular numbers.
1 min read
Messaging Guidelines for the US and Canada
Which texts need A2P registration or identity verification, depending on the sending number and the recipient's country.
1 min read
Voice Intelligence
Get automatic call summaries, QA scores, contact field suggestions and disposition suggestions after every recorded call.
1 min read
Website Compliance Guide for A2P 10DLC
Make sure your website meets what A2P reviewers check: a secure live site, clear business identity, opt-in, Privacy Policy and Terms.
1 min read
What Reviewers Check During RCS Sender Registration
The checks your RCS sender goes through, from the initial completeness review to carrier approval, and how to pass them.
1 min read
What Is A2P 10DLC? Brand and Campaign Registration
What A2P 10DLC is, why US carriers require it, and the steps to register your brand and campaign.
1 min read
What Is CNAM?
How Caller ID Name (CNAM) shows your business name on outbound calls, and how it fits with SHAKEN/STIR and Voice Integrity.
1 min read
What Is SHAKEN/STIR?
How SHAKEN/STIR authenticates your outbound calls, how it helps answer rates, and how to set it up.
1 min read
Why SMS in Mexico May Show a Different Number
Why Mexican carriers may replace your sender number on texts, and how to set expectations with recipients.
1 min read
Why Was My Toll-Free Verification Rejected?
Common toll-free verification rejection codes, what they mean and how to fix and resubmit.
1 min read
Why Are My Calls Marked as Spam, and How Can I Avoid It?
Common reasons calls get labeled "Spam Likely", and the steps to fix and prevent it.
1 min read
Why Doesn't My Business Name Show After CNAM Registration?
Why your registered CNAM name may not appear on every call, and what you can do about it.
1 min read
Workflow Trigger: Call Details
Start workflows automatically based on call direction, status, disposition, number or number pool.
1 min read
A2P Requirements for Canadian 10DLC Numbers
When Canadian local numbers need A2P 10DLC registration or identity verification, and how to register.