--- title: "CallTower - Porting Number Tips" slug: "calltower-porting-number-tips" tags: ["calltower", "public"] updated: 2026-07-31T17:26:00Z published: 2026-07-31T17:26:00Z canonical: "learn.calltower.com/calltower-porting-number-tips" --- > ## Documentation Index > Fetch the complete documentation index at: https://learn.calltower.com/llms.txt > Use this file to discover all available pages before exploring further. # CallTower - Porting Number Tips **Last updated:** Jul 2, 2026, 12:33 PM by jkoltis@calltower.com ## Purpose This guide is designed to help customers understand the **number porting process** and avoid common issues that may delay or disrupt service. Local Number Portability (LNP) allows you to keep your existing phone numbers when changing carriers or moving service. While this process may seem simple, it is governed by strict rules and regulations that protect both customers and carriers and ensure compliance with FCC requirements. Understanding these requirements upfront helps ensure a **smooth, successful port with minimal risk of service interruption**. ## Key Terms & Acronyms - **LNP (Local Number Portability):** The process of moving phone numbers to a new carrier - BTN **(Billing Telephone Number):** The main account number on file with your current carrier - LOA **(Letter of Authorization):** A form authorizing CallTower to request the port on your behalf - CSR **(Customer Service Record):** A record from your current carrier containing account details - CPNI **(Customer Proprietary Network Information):** Protected account data that only you can authorize - LSP **(Losing Service Provider):** Your current carrier - FOC **(Firm Order Commitment):** The confirmed port date provided by the carrier - PON **(Purchase Order Number):** Carrier‑to‑carrier tracking reference - LSR **(Local Service Request):** Carrier‑to‑carrier port request - RESPORG**:** The carrier that owns and controls a toll‑free number ## Number Porting Process Overview 1. **Submit a completed LOA** to CallTower to begin the porting process 2. **Provide accurate account details** from your current carrier (CSR or recent invoice) 3. CallTower submits the port request to your current carrier 4. Due to CPNI regulations, CallTower **cannot access or modify your account** with your current carrier 5. Once approved, the carrier provides an **FOC date**, confirming when the port will occur ## Common Porting Issues & How to Avoid Them ### 1. Address & ZIP Code Mismatch **Cause:** The address on the LOA does not match the carrier’s records **How to Avoid:** Request a CSR before submitting your port **How to Fix:** Verify address and ZIP code with your carrier and resubmit ### 2. Incorrect BTN **Cause:** The BTN on the LOA does not match carrier records **How to Avoid:** Use the BTN listed on your CSR and confirm all numbers **How to Fix:** Identify rejected numbers and obtain the correct BTN from your carrier ### 3. Partial Port Issues **Cause:** The BTN is ported while other numbers remain active on the account **How to Avoid:** Ask your carrier to assign a new BTN to remaining numbers or terminate them **How to Fix:** Resubmit the port with proper termination or carrier instructions ### 4. Pending Orders on the Account **Cause:** Existing changes or disconnect orders block the port **How to Avoid:** Ensure no active changes are pending before submitting the port **How to Fix:** Contact your carrier to clear pending orders ### 5. Account Freeze **Cause:** Carrier places a hold due to unpaid balances or fraud protection **How to Avoid:** Confirm your account is active and in good standing **How to Fix:** Contact your carrier to remove the account freeze ### 6. Number Inactive or Not Found **Cause:** The carrier has the number listed as inactive or non‑portable **How to Avoid:** Confirm numbers are active by placing test calls and verifying with the carrier **How to Fix:** Work directly with your carrier to restore active status before resubmitting ### 5. Quick Tips for a Smooth Port - Ensure your account is **active and in good standing** - Obtain a **current CSR or invoice** from your carrier - Double‑check: - BTN and account number - Service address - ZIP code - Ensure the **authorized contact** on your carrier account signs the CallTower LOA ### 6. Toll‑Free Number (TFN) RespOrg Change & Porting **Step 1: Ownership Change** When RESPORG is moved to CallTower: - Ownership of the toll‑free number transfers in **SOMOS** (the national toll‑free database) **Step 2: Pre‑Port Routing** In most cases: - Toll‑free numbers are released to CallTower **before the scheduled port date** - The losing carrier continues routing calls until the port is triggered on the FOC date - CallTower’s Telecom team triggers the port using Sinch routing on the scheduled date **Step 3: Carrier Routing Risk** Some toll‑free carriers may: - Remove routing early once they no longer own the number - This can cause: - Calls to fail - Temporary loss of service In these cases, the losing carrier may not restore routing. **Step 4: Resolution & Best Practice** To reduce downtime risk: - CallTower initiates the port **as soon as RESPORG is received** - Requirements: - Customer routing must be pre‑built - CallTower routing must be pre‑built in Connect and related systems Once CallTower receives RESPORG: - CallTower will notify you - The port will be triggered **the same day** whenever possible ## Best Practices to Prevent Service Interruption - Submit toll‑free ports **at least 8 days** before the requested port date - Be aware there is always some risk of interruption if the losing carrier removes routing early - To mitigate risk: - Ensure customer‑side provisioning is complete - Ensure CallTower provisioning is complete **before FOC is received** ## If Issues Occur **If the FOC date is set but still days away:** - CallTower will notify you of the confirmed date - CallTower may offer to **trigger the port early** to avoid service interruption **If service is interrupted:** - Contact your CallTower IPM or LNP representative - If CallTower owns RESPORG: - Telecom will trigger the port immediately - Service will be restored as quickly as possible ## Final Note Number porting involves multiple carriers and regulatory safeguards. While delays can occur, **accurate information, preparation, and coordination** significantly reduce risk. CallTower is committed to guiding you through each step to ensure a smooth transition with minimal disruption. --- ### ### ### ### ### ### ### FAQ #### What should I do if my address and ZIP code do not match the carrier's records? You should verify your address and ZIP code with your carrier and resubmit the port request. #### Can I port my number if my account is inactive? No, you need to ensure your account is active and in good standing before initiating the porting process. #### What happens if there are pending orders on my account? Pending orders can block the port, so you should ensure there are no active changes before submitting the port request. #### How can I avoid service interruption during the porting process? To avoid service interruption, submit toll-free ports at least 8 days before the requested port date and ensure all provisioning is complete. #### What should I do if I experience service interruption after the port? Contact your CallTower IPM or LNP representative for assistance. #### Is it necessary to provide a current Customer Service Record (CSR)? Yes, providing a current CSR or recent invoice from your carrier is essential for a smooth porting process. Local Number Portability - The process of moving phone numbers to a new carrier. Billing Telephone Number - The main account number on file with your current carrier. Letter of Authorization - A form authorizing CallTower to request the port on your behalf. Customer Service Record - A record from your current carrier containing account details. Customer Proprietary Network Information - Protected account data that only you can authorize. Losing Service Provider - Your current carrier. Firm Order Commitment - The confirmed port date provided by the carrier. Purchase Order Number - Carrier‑to‑carrier tracking reference. Local Service Request - Carrier‑to‑carrier port request. The carrier that owns and controls a toll‑free number. Telecommunications, the transmission of information over significant distances by electronic means.