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Ruggedized Analog Telephony Adapter (ATA)
What are FXS and FXO •• Analog ports | 3CX
Grandstream HT503 ATA/IAD 1 FXS 1 FXO Port SIP Voip gateway Adapter with Lan and Wan|gateway external laptop battery charger|adapter rcagateway voip - AliExpress
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FTA5102E2 2 FXS VoIP Analog Telephone Adapter - Flyingvoice