2N Lift8 v1.6.0 - Manual (Page 112)

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2N TELEKOMUNIKACE a.s., www.2n.cz
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Troubleshooting
fails to respond correctly to DTMF commands, e.g. the programming mode cannot L8
be entered.
Today, voice transmission is prevailingly digital, using variable compression algorithms.
Therefore, the DTMF signal to be transmitted is often distorted. Moreover, it may, in
some cases, be transmitted through the so-called command channel, whose delay may
differ from that of the speech channel.
In such cases, try some other equipment (a digital PBX, e.g.) or the machine room
telephone set. If the machine room or PSTN programming attempts fail too, you have
probably entered an invalid password.
Programming via Service Tool
Refer to the section (Section 5) for details. 2N Service Tool
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Caution
Experience shows that, especially recently, it is practically impossible to
recover the DTMF signal in GSM networks!