C-4FXO, 4 FXO Ports, Analog Telephony Card for IP PBX-C301/C302/C503 - FS.com
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ADTRAN 2ND GEN TA 924E 4242924L2 16 FXS + 8 FXO Interfaces Router | eBay
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The difference between FXO and FXS
The difference between FXO and FXS
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Adtran Total Access 924e 3rd Generation With 1 Lifeline FXO 4243924F2
CISCO NIM-2FXS/4FXO 2-Port FXS 4-Port FXO ISR Router Voice Fax Interface Module | eBay
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0231A53F 3Com 4-Port FXO Multi-function Interface Module 4 x FXO WAN Multi-function Interface
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NIM-4FXO 4-port Network Interface Module - FXO (Universal)
