Phone to Phone
It is a type of communication between two ordinary phones, which are connected and voice transmits over telecommunication network.
HandyTone 502 (HT-502) from Grandstream is an analog 2xFXS, 2xETH VoIP Gateway (SIP ATA adapter) with the integrated router.
International of Voip company USA
This is the good line of voip. And this rate is cheap. So plz contact with me.
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