General
Maximum number of users	20
Maximum simultaneous calls	10
Maximum FXS/FXO ports	4
Version	V4

The Yeastar S20 is an IP-PBX in wall-mounted version, designed for small to medium-sized enterprises. It offers a hybrid telephone system with support for SIP trunking and integrated network management. The device is available in version V4 and supports up to 20 users as well as 20 SIP trunks. The maximum number of simultaneous calls is 10. The S20 features two module slots that can be used for expansion with additional interfaces. The maximum number of BRI ports is four, as is the maximum number of FXS/FXO ports. A GSM module can be optionally added to enable mobile connections.

Applications

The Yeastar S20 is suitable for companies requiring a central telephone system with IP telephony and analog connections. It is particularly suitable for locations with limited space, as it is designed for wall mounting. The support for SIP trunks enables the use of VoIP services, while the analog interfaces (FXS/FXO) allow connection of traditional telephones or ISDN links. The system is designed for up to 20 users, making it suitable for small offices, service providers, or branches.

Functions and Equipment in Detail

The S20 offers a range of license-free functions that can be used without additional costs. These include call recording, an integrated voicemail function, the use of remote extensions, an interactive voice response system (IVR), and the ability to perform blind call transfers. The Fax to Email function enables incoming faxes to be converted into email messages. The Auto-Provisioning function supports automatic configuration of IP telephones from brands such as Yealink, Snom, Polycom, Cisco, Grandstream, and Htek, simplifying the setup and maintenance of the system.

Technology Explained Simply

The IP-PBX operates as a central switching station for telephone connections in the network. It enables connection of IP telephones via the local network (LAN) and simultaneously supports connection of analog devices via FXS and FXO interfaces. The SIP trunking function allows the use of internet-based telephone lines, enabling external calls to be routed over the internet. The module slots offer flexibility for system expansion, such as integrating BRI modules for ISDN connections or FXS/FXO modules for analog connections. The maximum support for four BRI ports and four FXS/FXO ports allows flexible adaptation to specific requirements.

Compatibility and Accessories

The Yeastar S20 can be expanded with various accessory modules. These include a PBX accessory module with two FXO ports, a module with two FXS ports, an SO module with one FXS and one FXO port, and a PBX accessory module with two BRI ports. These modules can be installed in the two available module slots to increase the number of analog or ISDN connections. The Auto-Provisioning function supports IP telephones from various manufacturers, enhancing compatibility with existing end devices.

Mounting and Installation

The S20 is designed for wall mounting, enabling space-saving installation. Setup is performed via a web interface accessible over the network. Configuring the system requires basic knowledge in network and telephone system management. The Auto-Provisioning function simplifies the setup of IP telephones, as they can be automatically configured once connected to the network.

Advantages in Operation

The Yeastar S20 offers a combination of IP telephony and analog connections, enabling flexible use. License-free functions such as call recording, voicemail, and IVR reduce operating costs, as no additional licenses are required. Support for remote extensions allows telephone system use from outside the company, for example by employees working from home. The Auto-Provisioning function reduces the effort required for setting up and maintaining IP telephones, lowering operating costs and increasing efficiency.