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12KHz / 16KHz

  • This topic has 7 replies, 1 voice, and was last updated 16 years ago by Teodor Georgiev.
Viewing 8 posts - 1 through 8 (of 8 total)
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  • #29165 Reply

    I am looking for VoIP GW (analogue FXS interface) that can generate 12KHz or 16KHz for an application involving real time billing on a Hotel’s PBX. Another method that could be used is battery reversal. Please advise!

    #29166 Reply

    Does anyone have experience in installing VoIP GWs to trunk port of Hotel PBXs where the PBX uses metering pulse for its PMS billing? Thanks.

    #29167 Reply
    Teodor Georgiev

    I do have.
    But with the help of external micro-devices sitting between the gateway and the PBX.
    So far I have seen a gateway being capable of sending 12/16Khz billing outpulses. What the gateways can do is just to reverse the polarity when a call starts/ends.

    #29168 Reply

    Thanks Teodor, I see understand what you mean. Do you think there would be a demand for such GW?

    #29169 Reply
    Teodor Georgiev

    could be. I think – yes.
    Also, the newer billing systems used on PBXes with ISDN PRI rely not on the 12/16Khz, but on the ETSI AOC (Advice of Charge) messages.
    The beast (Cisco) does not pass AOC messages between its PRI interfaces.
    Go figure it 🙂

    #29170 Reply

    Hello Teodor i’m facing the same problem what kind of device can i use to do so ?


    #29171 Reply

    The LEAD Access system ( has end-units which supports 12/16KHz metering pulse.
    However, they sell the end unit gateways only to operators and ISPs as part of their system.
    I don’t know if it helps you…?!

    #29172 Reply
    Teodor Georgiev

    I have a contact with a local company who produces such kinds of devices (12/16Khz, polarity reversal, displays to outputlse/display the charging units).
    Contact me at if interested. I am not going to advertise.

Viewing 8 posts - 1 through 8 (of 8 total)
Reply To: 12KHz / 16KHz
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