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  1. Get Grand Stream 4108 to send flash to PSTN line

    Panasonic KX-TA624, KX-TA824, KX-TAW848 are just a few Analog PBX systems that pass a flash from an extension out to a trunk.
  2. PSTN Hook Flash for 3 way call / Call Transfer

    Our PSTN (Frontier Communications) provides 3 way calling & Call Transfer which require a "hookflash" in order to take advantage of the calling features. Currently I have a 3CX system with a Grandstream GXW4104 Analog FXO gateway and Yealink SIP-T38G phones. Currently when the 3CX system...
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