long continuos tone before call starting

  1. Long Continuous Tone Before call starting using 3CX phone for Windows in CTI mode connected to Grandstream GXP2135 IP Phone

    Hi Everyone, I’m writing on this forum in order to known if someone has faced and eventually resolved the following issue: using a 3CX phone in CTI mode connected to a Grandstream GXP2135 IP phone, a long continuous tone is generated before call starting. The used system has the following...
    • Martino Lombardi
    • Thread
    • 3cx phone for windows cti mode grandstream gxp2135 long continuos tone before call starting
    • Replies: 14
    • Forum: Other
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