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GSM Gateway User Manual
www.allo.com Version 2.0 20
Advanced Options
DTMF
Set default DTMF mode for sending DTMF digits. Options:
INBAND – sent along with audio (requires 64 kbit codec -
alaw, ulaw)
INFO – sent as SIP INFO messages
RFC2833 – sent as RTP packets
AUTO – System automatic selects the mode. Uses
RFC2833 if offered, inband otherwise.
Default:
AUTO
NAT
Enable it, to address NAT-related issue for SIP & media sessions
for this trunk.
Configuring NAT settings under SIP Global Settings is
required) Default:
disabled
Codec Configuration
Choose the available Codecs and set GSMority in the order in
which gateway should prefer to send and receive audio.
Supported codecs are alaw, ulaw, G.729, G.722
Figure 54: SIP Trunks
4.1.5 GSM Lines
Navigate through
Setup
>
Basic
>
GSM Lines
GSM Trunks provides the interface to any GSM companion such as GSM service provider. Create
an interface for each span.