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.
Safarivoip
A to Z Termination Router and End user solution mobile dialer,pctophpne callshop
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