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CallTower CallTower is a private company founded in 2002 that provides cloud-based unified communications as a service (UCaaS), contact center as a service (CCaaS), collaboration, and conversational AI solutions to enterprises worldwide.[1][2][5] It … read more ↓
Transfer network
How toll free numbers move between CallTower (AX) and other Resp Orgs, reconstructed from Somos registry snapshots. Larger nodes = more transfer volume; CallTower is highlighted. Open the full interactive map →
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- Website: https://www.calltower.com/ Domain since 2001 (25y)
- Phone: (800) 347-5444 via web search: www.calltower.com
At a glance
#114 of 206 oldest
Inventory by NPA
Click any NPA for total pool inventory across the industry.
By status
- WORKING 23,622, 100.0%
- TRANSIT 3, 0.0%
Inventory age buckets
- 1–3 months 588, 2.2%
- 3–12 months 4,739, 17.4%
- 1–2 years 4,270, 15.6%
- 2–5 years 9,435, 34.6%
- 5+ years 4,590, 16.8%
Ages are measured from each number's last change in the Somos registry, that's the most recent activation, transfer, or status move. Not necessarily the date this RespOrg originally acquired it.
Request a manual history review of a specific toll free number →
Trajectory
Show monthly numbers
| Month | Inventory | Acquired | Harvested | Lost | From spare | To spare |
|---|---|---|---|---|---|---|
| 2018-03 | 5,869 | 0 | 0 | 0 | 0 | 0 |
| 2018-06 | 6,045 | 248 | 0 | 72 | 39 | 7 |
| 2018-09 | 6,094 | 181 | 0 | 132 | 50 | 33 |
| 2018-10 | 7,393 | 1,326 | 0 | 27 | 13 | 10 |
| 2018-11 | 7,443 | 76 | 0 | 26 | 17 | 1 |
| 2018-12 | 7,438 | 42 | 0 | 47 | 3 | 1 |
| 2019-01 | 7,465 | 54 | 0 | 27 | 5 | 0 |
| 2019-02 | 7,376 | 62 | 0 | 151 | 13 | 1 |
| 2019-03 | 7,314 | 54 | 0 | 116 | 20 | 0 |
| 2019-04 | 7,310 | 84 | 0 | 88 | 15 | 3 |
| 2019-05 | 7,363 | 109 | 0 | 56 | 16 | 0 |
| 2019-06 | 7,411 | 79 | 0 | 31 | 22 | 0 |
| 2019-08 | 7,169 | 206 | 0 | 448 | 30 | 368 |
| 2019-09 | 7,556 | 420 | 0 | 33 | 381 | 2 |
| 2019-10 | 7,594 | 56 | 1 | 18 | 15 | 0 |
| 2019-11 | 7,625 | 55 | 0 | 24 | 5 | 0 |
| 2019-12 | 7,615 | 41 | 0 | 51 | 8 | 0 |
| 2020-01 | 7,611 | 46 | 0 | 50 | 4 | 0 |
| 2020-02 | 7,589 | 41 | 1 | 63 | 9 | 0 |
| 2020-03 | 7,727 | 158 | 0 | 20 | 2 | 0 |
| 2020-04 | 7,775 | 59 | 0 | 11 | 21 | 0 |
| 2020-05 | 7,811 | 103 | 0 | 67 | 16 | 2 |
| 2020-06 | 7,896 | 140 | 0 | 55 | 5 | 1 |
| 2020-07 | 7,974 | 102 | 0 | 24 | 10 | 0 |
| 2020-08 | 7,944 | 31 | 0 | 61 | 6 | 0 |
| 2020-09 | 8,061 | 156 | 0 | 39 | 18 | 0 |
| 2020-10 | 8,094 | 85 | 0 | 52 | 11 | 2 |
| 2020-11 | 8,147 | 90 | 0 | 37 | 5 | 1 |
| 2020-12 | 8,186 | 72 | 0 | 33 | 13 | 1 |
| 2021-01 | 8,223 | 66 | 0 | 29 | 27 | 1 |
| 2021-02 | 8,179 | 82 | 0 | 126 | 3 | 0 |
| 2021-03 | 8,192 | 87 | 1 | 74 | 14 | 2 |
| 2021-04 | 8,232 | 80 | 0 | 40 | 10 | 2 |
| 2021-05 | 8,290 | 112 | 0 | 54 | 7 | 0 |
| 2022-05 | 8,608 | 1,316 | 3 | 998 | 98 | 2 |
| 2022-06 | 8,699 | 120 | 0 | 29 | 8 | 0 |
| 2022-07 | 8,804 | 149 | 0 | 44 | 17 | 1 |
| 2022-08 | 9,301 | 534 | 0 | 37 | 7 | 10 |
| 2022-09 | 9,450 | 183 | 0 | 34 | 8 | 0 |
| 2022-10 | 9,820 | 415 | 0 | 45 | 38 | 0 |
| 2022-11 | 10,016 | 225 | 0 | 29 | 37 | 0 |
| 2022-12 | 10,252 | 268 | 1 | 32 | 25 | 0 |
| 2023-01 | 10,418 | 194 | 0 | 28 | 23 | 0 |
| 2023-02 | 10,587 | 187 | 0 | 18 | 69 | 0 |
| 2023-03 | 10,733 | 179 | 0 | 33 | 20 | 0 |
| 2023-04 | 11,097 | 438 | 0 | 74 | 23 | 48 |
| 2023-05 | 11,259 | 170 | 0 | 8 | 14 | 1 |
| 2023-06 | 13,217 | 1,983 | 0 | 25 | 11 | 2 |
| 2023-07 | 8,804 | 269 | 0 | 4,682 | 0 | 155 |
| 2023-08 | 13,577 | 5,091 | 9 | 318 | 199 | 1 |
| 2023-09 | 13,970 | 445 | 0 | 52 | 8 | 0 |
| 2023-10 | 14,110 | 168 | 0 | 28 | 11 | 1 |
| 2023-11 | 14,787 | 735 | 0 | 58 | 8 | 1 |
| 2023-12 | 17,031 | 3,329 | 3 | 1,085 | 305 | 0 |
| 2024-02 | 14,710 | 510 | 0 | 2,831 | 0 | 290 |
| 2024-03 | 14,722 | 145 | 0 | 133 | 35 | 0 |
| 2024-04 | 14,878 | 193 | 0 | 37 | 18 | 0 |
| 2024-05 | 14,982 | 150 | 0 | 46 | 38 | 0 |
| 2024-06 | 15,111 | 156 | 0 | 27 | 10 | 0 |
| 2024-07 | 15,605 | 524 | 0 | 30 | 19 | 0 |
| 2024-08 | 15,726 | 151 | 1 | 30 | 12 | 0 |
| 2024-09 | 16,076 | 372 | 0 | 22 | 45 | 0 |
| 2024-10 | 16,393 | 404 | 0 | 87 | 11 | 0 |
| 2024-11 | 16,501 | 179 | 0 | 71 | 15 | 0 |
| 2024-12 | 16,846 | 370 | 0 | 25 | 41 | 0 |
| 2025-01 | 17,190 | 399 | 1 | 55 | 133 | 0 |
| 2025-02 | 17,322 | 183 | 0 | 51 | 14 | 0 |
| 2025-03 | 17,322 | 0 | 0 | 0 | 0 | 0 |
| 2025-04 | 18,573 | 1,307 | 1 | 56 | 43 | 0 |
| 2025-05 | 18,891 | 356 | 0 | 38 | 18 | 0 |
| 2025-06 | 19,026 | 210 | 0 | 75 | 23 | 0 |
| 2025-07 | 19,205 | 226 | 1 | 47 | 68 | 0 |
| 2025-08 | 19,659 | 557 | 2 | 103 | 17 | 0 |
| 2025-09 | 19,821 | 226 | 0 | 64 | 22 | 0 |
| 2025-10 | 20,196 | 409 | 1 | 34 | 40 | 0 |
| 2025-11 | 20,611 | 441 | 0 | 26 | 14 | 0 |
| 2025-12 | 20,744 | 141 | 2 | 8 | 9 | 0 |
| 2026-01 | 22,464 | 1,782 | 0 | 62 | 29 | 0 |
| 2026-02 | 22,923 | 484 | 4 | 25 | 27 | 0 |
| 2026-03 | 23,077 | 187 | 0 | 33 | 9 | 0 |
| 2026-04 | 23,152 | 357 | 1 | 282 | 33 | 0 |
| 2026-05 | 23,340 | 239 | 3 | 51 | 61 | 0 |
| 2026-06 | 23,639 | 324 | 0 | 25 | 7 | 0 |
Flow patterns (42-month cumulative)
Inbound (numbers acquired)
| Direct transfer from another RespOrg | 88,122.0 |
| Harvested from disconnect pool | 108.0 |
| First assigned from spare pool | 7,719.0 |
| Reactivated own disconnects | 3.0 |
Outbound (numbers lost)
| Direct transfer to another RespOrg | 52,928.0 |
| Standard disconnect aging process (3+ months in DISC) | 15 |
| Abbreviated disconnect period (1–2 months in DISC) | 40 |
| Released directly to spare pool | 3,800.0 |
Of the 55 disconnect episodes this RespOrg has sent through aging, 73% were abbreviated (1–2 snapshots in DISC status). That's a strong early-disconnector signal, this RespOrg routinely releases numbers before the full 3–4 month aging window. Worth checking daily for vanity drops.
Top direct-transfer sources (INto AX)
| LQ | 4,094.0 | Inteliquent |
| KS | 3,464.0 | Lumen Technologies (Lumen) |
| JY | 2,982.0 | Bandwidth |
| AT | 2,542.0 | AT&T |
| VZ | 1,980.0 | Verizon Business (Verizon) |
| LG | 1,831.0 | Lumen Technologies (Lumen) |
| RB | 1,596.0 | RingCentral |
| SP | 1,059.0 | Sprint (T-Mobile) |
| RH | 858.0 | Porting.com DBA ATLaaS |
| AU | 852.0 | ATL Communications (ATLC) |
Summary
CallTower provides cloud-based, Unified Communications, Contact Center and Collaboration solutions since 2002.
About CallTower
CallTower is a private company founded in 2002 that provides cloud-based unified communications as a service (UCaaS), contact center as a service (CCaaS), collaboration, and conversational AI solutions to enterprises worldwide.[1][2][5] It is headquartered in South Jordan, UT, United States, with approximately 157 employees and $58 million in revenue.[5] No parent or holding company is mentioned in available sources.
Toll free / RespOrg activity: No specific news or details found regarding CallTower's toll-free or RespOrg (AXI01) activities.
AI-generated summary (confidence: medium), last updated 2026-04-30. Verify against primary sources before quoting.
Top vanity holdings
Contact-form message
with a customer of CallTower fka Appia