Yeastar Expansion Module O2

Technical Specifications: Yeastar O2

Feature	Specification
Ports	2 x RJ11 (FXO)
Interface	Analog PSTN Trunk
Loop Current	10mA to 120mA
Echo Cancellation	ITU-T G.168 LEC
Compatibility (S-Series)	S20, S50, S100, S300, S412
Compatibility (P-Series)	P550, P560, P570 (via EX08/EX30 Expansion Boards)
Signaling	FXO Loop Start
Dimensions	50 x 35 mm (Compact Internal Module)

Transitioning Businesses: Perfect for companies moving from an old analog PABX to a modern VoIP system who aren’t ready to port their numbers to a SIP provider yet.
Hybrid Connectivity Strategies: Use traditional landlines for high-reliability incoming calls and SIP trunks for low-cost international outgoing calls.
Emergency Failover: Configure your PBX to use the analog lines as a “backup” trunk—if your fiber internet or SIP service goes down, your office can still make calls via the copper landline.
Areas with Unstable Internet: Ideal for locations where VoIP/SIP performance is inconsistent, providing a rock-solid analog backbone for voice communications.

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