Field Description
Possible values:
• + 3/1: ISDN codec according to US law
• + /1: ISDN codec according to EU law
• +: Compressed from 31 to 8 kbps; good voice quality
• +: Compressed from 63 to 40 kbps
• +$: Compressed from 55 to 32 kbps
• +: Compressed from 47 to 24 kbps
• +: Compressed from 39 to 16 kbps
• .(%9 :3: DTMF Outband. First the system attempts to
use RFC 2833. If the remote terminal does not use this stand-
ard, SIP Info is used.
• ($ 9<: Allows the transmission of fax messages over
data networks.
• *@(: SRTP is an encrypted variant of the Real-Time Trans-
port Protocol (RTP).
• . @92 : Enable the transport of 64 kbit/s channel
data in RTP packets.
By default + 3/1, + /1 and + are enabled.
The codecs actually used are the intersect of the codecs
defined here and those signalled by the provider. For outgoing
calls, any remaining codecs are dropped from the list that would
require more than the available bandwidth.
Fields in the Voice Quality Settings menu.
Field Description
Echo Cancellation Select whether echo cancellation should be used.
Echo cancellation is a technique to suppress echo feedback in
voice communication on full duplex lines.
The function is enabled with ,.
The function is enabled by default.
Comfort Noise Genera-
tion (CNG)
Specify whether Comfort Noise Generation should be used.
For digital voice transmission, this function introduces a low
20 VoIP Teldat GmbH
414 bintec Rxxx2/RTxxx2
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