Signal House: A2P Messaging Without the Markup
Carriers tightened Application-to-Person Messaging (A2P) on local numbers, and blasting from an unregistered long code no longer works. Brands now need 10-Digit Long Code (10DLC) registration, campaign classes, and a send path that actually reaches AT&T, T-Mobile, and Verizon.
Agencies feel it first. A client’s Short Message Service (SMS) program dies in a ticket queue. A Communications Platform as a Service (CPaaS) invoice adds hops nobody asked for. Multimedia Messaging Service (MMS) fails for reasons the customer relationship management (CRM) never shows. The operators who still get texts delivered treat registration, numbers, and the send path as one job.
Signal House
Signal House is a U.S. messaging aggregator for registered 10DLC SMS and MMS. Teams file brands and campaigns with The Campaign Registry (TCR), buy or port local numbers, and send through an Application Programming Interface (API), HubSpot, or GoHighLevel without adding another hop to the carrier.
Most stacks fail on the path, not the copy. Signal House sits closer to U.S. carriers than a typical reseller chain, which is the point of a Tier 2 aggregator: fewer handoffs, fewer places for a registered campaign to stall. According to Signal House, deliverability sits above 95 percent, and the company cites G2 rankings that place it among the top five CPaaS tools and first for ease of implementation.
Cost is the other reason teams leave Twilio. Signal House publishes usage rates rather than a named SaaS tier, with 10DLC outbound SMS starting at $0.0065 per segment and stepping down at volume, local numbers from $1.00 per month, and TCR brand and campaign fees passed through with no added margin. According to Signal House, customers have saved $25,000 to $40,000 a month versus Twilio, with similar percentage cuts cited against Plivo, Vonage, Sinch, and Soprano.
It is not a campaign builder. Signal House does not replace HubSpot or GoHighLevel. It delivers the messages those tools already want to send, with TCR registration, number inventory, and carrier analytics in the same account, so an agency or SaaS team isn’t juggling a registrar, a number desk, and a ticket queue.
What You Can Run From One Account
The Signal House portal, APIs, and marketplace apps share the same registered 10DLC backbone. That means a HubSpot workflow, a GoHighLevel bulk send, and a custom API call can use the same brands, campaigns, and numbers.
- 10DLC SMS: Local 10-digit A2P texting with per-message timing in the portal. Published timing on this path is sub-one-second delivery to major U.S. carriers.
- Analytics and Billing Transparency: Filter usage by number, brand, campaign, carrier, tag, and status. Carrier pass-throughs are itemized so TCR and network fees do not hide inside a blended rate.
- APIs and SDKs: Redundant, auto-scaling messaging APIs with documentation and sandboxes, plus software development kits (SDKs) for teams that will not live in a CRM plugin.
- GoHighLevel Integration: A marketplace app for 1:1 and bulk SMS/MMS, agency-level brands and campaigns, shared campaigns, wallet billing inside GoHighLevel, and SAS rebilling so agencies can set margins. A Voice Dialer is published as live on this surface.
- Group SMS: Multi-party threads for warm intros and stakeholder updates, not just one-to-one blasts.
- HubSpot Integration: 1:1 and bulk SMS/MMS in Conversation View, activities on contacts, tickets, and deals, workflow actions, keyword triggers, failed-message retries, a
sihou.ioshortener, and shared numbers. HubSpot plans include a monthly allotment of free messages. - MMS: Images, video, GIFs, files, and voice memos on the same registered numbers used for SMS.
- Number Inventory and Porting: Buy from an inventory the company maintains with over 10 million numbers, or port existing lines (soft or hard, with a letter of authorization) and assign them to campaigns.
- Portal Hierarchy: Groups and sub-groups so an agency or multi-brand operator can keep brands, campaigns, numbers, and analytics separated without a second vendor account.
- Support: 1:1 chat and email as the default. High-volume accounts (500,000+ segments per month, on the public pricing page) get dedicated Slack, with replies cited under 90 seconds on that channel.
- The Campaign Registry Registration: Create brands and campaigns in-platform (marketing, customer care, political, Two-Factor Authentication (2FA), and others), including a campaign-service-provider path and TCR migration. Approvals are quoted as pay-as-you-go within 72 hours, or 48 hours at 500,000+ segments per month.
Taken together, those pieces cover the job most teams actually hire a CPaaS for: get registered, get numbers, send SMS and MMS, and see why a message failed. Signal House is still building some surfaces (Rich Communication Services (RCS), short code, and alphanumeric sender IDs appear as coming soon on vendor pages), so U.S. and Canada 10DLC is the product to evaluate today.
Getting Started
Create an account or book a demo, then register the brand and campaign in TCR from the Signal House portal. Buy local numbers or start a port, assign them to the approved campaign, and send from HubSpot, GoHighLevel, or the API. Usage is billed as you go; rates are published and negotiable at volume.
If your current stack is a CRM or an agency OS, start with the native app so conversation history stays on the contact. If you already own the messaging UX, the API is the shorter path. Either way, the constraint is no longer finding a long code. It is filing the campaign correctly and measuring the carrier path you actually paid for.
