QSC CTEL4 – Q-SYS Core 510i POTS Telephony I/O Card (4-Port) is backordered and will ship as soon as it is back in stock.
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Product Overview
The QSC CTEL4 is a Q-SYS POTS telephony I/O card that connects a Core 510i processor to analog (plain old telephone service) phone lines for paging, emergency notification, and voice integration. It provides four RJ-11 interfaces in a single card slot, letting integrators bring analog telephony into Q-SYS audio routing and control. As a Q-SYS Core 510i I/O card, the CTEL4 adds POTS telephony connectivity to the AV&C system without external interface hardware.
Product Description

The CTEL4 installs in a Q-SYS Core 510i card slot and presents four RJ-11 connections to analog telephone lines. It enables dial-in paging, telephone-based emergency announcements, and POTS line integration within Q-SYS designs, with routing and control managed in Q-SYS Designer Software. The card can be combined in any slot configuration with other Core 510i cards such as the CIML4 mic/line input card and COL4 line output card. The CTEL4 is supported by the Q-SYS Core 510i processor.
Key Features
- Four RJ-11 POTS interfaces — Connects up to four analog telephone lines to Q-SYS in a single card slot.
- Analog telephony integration — Brings POTS-based paging, emergency notification, and voice into Q-SYS audio routing.
- Q-SYS Core 510i I/O card — Installs in a Core 510i card slot; combinable with other Q-SYS I/O cards in any configuration.
- Managed in Q-SYS Designer — Telephony routing and control configured alongside the rest of the AV&C system.
Typical Applications
- Government space emergency paging and notification
- Commercial meeting space telephone paging
- House of worship dial-in announcements
- Multi-purpose room POTS integration
Technical Specifications
| Model | CTEL4 |
| Type | Q-SYS POTS telephony I/O card |
| Interfaces | 4 x RJ-11 (analog POTS) |
| Compatible processor | Q-SYS Core 510i (card slot) |
| Configuration | Combinable with other Core 510i I/O cards in any slot |
Frequently Asked Questions
What does the CTEL4 connect to?
The CTEL4 provides four RJ-11 interfaces that connect a Q-SYS Core 510i to analog telephony (POTS) lines for paging, emergency notification, and voice integration.
Which processor is it compatible with?
The CTEL4 is a Q-SYS Core 510i I/O card and installs in a Core 510i card slot. It can be combined with other Core 510i I/O cards in any slot configuration.
How is it configured?
Telephony routing and control are configured in Q-SYS Designer Software alongside the rest of the Q-SYS audio, video, and control system.
Is it covered by a warranty?
The CTEL4 is covered under QSC's standard warranty terms. For current warranty details and support, contact Creation Networks or refer to QSC's published warranty terms.
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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