CallTower AX
alias: formerly known as Appia Communications
- Website: https://www.calltower.com/ Domain since 2001 (25y)
At a glance
#112 of 201 oldest
Inventory by NPA
Click any NPA for total pool inventory across the industry.
By status
- WORKING 23,117 · 99.9%
- RESERVED 18 · 0.1%
- TRANSIT 3 · 0.0%
Inventory age buckets
- 1–3 months 677 · 2.7%
- 3–12 months 4,605 · 18.2%
- 1–2 years 4,377 · 17.3%
- 2–5 years 9,469 · 37.5%
- 5+ years 3,989 · 15.8%
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 |
Flow patterns (42-month cumulative)
Inbound (numbers acquired)
| Direct transfer from another RespOrg | 57,186.0 |
| Harvested from disconnect pool | 54.0 |
| First assigned from spare pool | 4,242.0 |
| Reactivated own disconnects | 0.0 |
Outbound (numbers lost)
| Direct transfer to another RespOrg | 16,998.0 |
| Standard disconnect aging process (3+ months in DISC) | 7 |
| Abbreviated disconnect period (1–2 months in DISC) | 17 |
| Released directly to spare pool | 1,068.0 |
Of the 24 disconnect episodes this RespOrg has sent through aging, 71% 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 vanity holdings
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.
Contact-form message
with a customer of CallTower fka Appia