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What Product Suppose i Choose

Dear All,

I have 3 PSTN line, 2 for voice call and 1 for the fax, Which model suppose i use for 2 voice call and 1 to receive/sending fax ? Some ppl say its enough with S20 + 2 O2 card, some ppl say i can use S20 + 1 O2 + 1 SO, and the others also mention me to buy S50 with 2 02 with another 2 card for convert fax to IP (Dont under stand)

Please advice. TQ

 

 

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