2N Indoor Talk User Manual page 45

Ringing Time
outgoing calls are automatically terminated. If the calls are routed to the GSM
network via GSM gateways, you are advised to set a value longer than 20 s.
Minimum value: 1 s, maximum value: 600 s. Set 0 to disable the time parameter.
Audio
Enable/disable the audio codecs offered for call setup and set their priorities.
The tab below helps you define how DTMF characters shall be sent from the intercom.
Check the DTMF receiving options and settings of the opponent to make the function
work properly.
In-Band (Audio) – enable the classic method of sending DTMF in the audio band
using standardised dual tones.
RTP (RFC-2833) – enable sending DTMF via the RTP according to RFC-2833.
SIP INFO (RFC-2976) – enable sending DTMF via SIP INFO messages according
to RFC-2976.
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Limit – set the maximum call setup and ringing time in which all
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