The Yeastar S-Series VoIP PBX range includes four  appliances capable of providing a wide range of features when connected to SIP Trunk services through broadband Internet.

Each of Yeastar’s S-Series Appliances can terminate between 20 and 100 different SIP Trunk services with no change to system hardware or software. However, these Appliances are also able to take Yeastar’s range of plug-in modules so that you can use older line types in conjunction with (or even instead of), SIP Trunks.


This may be useful when you have unreliable broadband and want a back-up service in case of broadband failure. Or you might need a new phone system, but the broadband in your area is just not good enough for VoIP [yet!].  It’s also useful if you have numbers on analogue or ISDN lines that can’t be ported to VoIP. These modules make it easy to create a ‘hybrid’ PBX to make communications flexible and ultra-reliable.

Each S-Series Yeastar Appliance can use the same on-board modules:

S2 Module:

two FXSextension’ ports allowing connection of one or two analogue telephone devices such as; desk phones, DECT cordless phones, fax’ machines and credit-card terminals – to other system extensions and trunk line services.

O2 Module:

two FXO ‘central office’ ports terminating one or two analogue telephone trunk lines from the local PSTN Exchange (e.g. BT).

SO Module:

one FXS ‘extension’, and one FXO ‘central office’ port to connect an analogue telephone device, and an analogue line.

B2 Module:

two basic rate ISDN2e ports to support connections to one or two NTE boxes, providing two or four ISDN channels (2 or 4 trunk lines), with support of Caller ID and Direct Dial Number services.

GSM Module:

one SIM card can be slotted into this module and an antenna fitted to the Yeastar IP-PBX to support calls to and from the GSM mobile phone network. Call routing plans can be configured in the management of the PBX to use this module as the primary connection route when calls are placed to mobile numbers (to take advantage of provider’s call plans), and to use it as a fall-back trunk in case of broadband failure.

3G Module:

as for the GSM module, but for the 3G mobile phone network.

4G LTE Module:

this module will support 3G/4G mobile calls and data. It will support end-to-end VoIP from a mobile device (e.g. a smart-phone running Linkus VoIP app’), through mobile data network to VoIP extension phones on the company LAN.

EX30 Expansion Board:

can be installed in the S100 or S300 Appliances – to provide an RJ45 interface to a 30 channel Primary Rate ISDN30e, with support of Caller ID and Direct Dial Numbers.

EX08 Expansion Board:

is installed into S100 or S300 Appliances to mount up to four on-board modules on each EX08.

D30 Module:

When a D30 module is added to a Yeastar S100 PBX, its max. capacity is raised from 100 extensions to 200 extensions, and the number of concurrent calls raised from 30 to 60. When a D30 is added to an S300 PBX, its capacity is raised from 300 extensions to 400 extensions, and the number of concurrent calls raised from 60 to 90. A second D30 may also be added to the Yeastar S300 to push this up to 500 extensions and 120 concurrent calls.

This modular approach across Yeastar’s S-Series IP-PBX range allows you to be confident that any type of connection can be set up to enable you to take advantage of current and future services available in your area, expansion of your business, and competitive call-plan tariffs available to your business.

Contact Foxhall Solutions – 01787 228402 – to talk about your next phone system …