ZyXEL Communications IES-1248-51 Uživatelská příručka Strana 43

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Chapter 1 Introducing the IES-1248-51V
IES-1248-51V User’s Guide
43
Analog Modem Pass-through
The IES-1248-51V supports analog modem service over the voice channel.
Fax Pass-through
The IES-1248-51V supports fax service over the voice channel.
DTMF Relay
DTMF (Dual-Tone Multi-Frequency) relay detects DTMF signals and sends them
out-of-band (via H.248 or RTP) to the remote party. DTMF relay is used when a
low-bitrate voice codec might distort DTMF signals sent over the voice channel.
Country Code
Many settings governing call functions differ from one region to another. The IES-
1248-51V allows you to set these by entering a preconfigured country code. The
following variables are affected when you set the country code.
AC impedance
•PCM companding law
•Cadence ring
•Flash time
Pulse dial interval
Pay-signal type
Metallic Line Test
The IES-1248-51V provides the following metallic line test (MLT) measurements.
Foreign AC voltage (50Hz ~ 500Hz)
Foreign DC voltage
Hazardous potential test
Three-element capacitance test
Three-element resistance test
Ringing equivalency number test (REN measurement)
•Metering
Waiting tone The other party’s line is engaged.
Howler tone The handset has been left off-hook too long.
Table 2 Supported Tones
TONE INDICATION
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