Digium, Inc.
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Chapter 3: Telephone System Configuration
choose. You can select the order in which the codecs are used. The
codecs commonly available are u-law, a-law, GSM, G.726, G.722, and
G.729A. A registered G.729A license is required in order to use the
G.729A codec.
Caller ID - This is the number the trunk will try to use when making
outbound calls. For some providers it is not possible to set the Call-
erID with this option. Thus this option may be ignored. When making
outbound calls the following rules are used to determine which Caller
ID is used, if they exist:
–
The first Caller ID used is the Global CID defined in the Options
tab.
–
The Caller ID set in the VoIP Trunks configuration, if defined,
takes precedence over the Global CID.
–
The Caller ID set for the user making the call as defined in the
Users page will take precedence over the Global CID and the CID
set in VoIP trunks.
From Domain - If required by your provider, specify your primary
domain identity to show in the domain field of the From header for
outgoing SIP invites. Otherwise, only your IP address will be sent in
the From header.
From User - If required by your provider, specify the user to show in
the user field of the From header for outgoing SIP invites. Otherwise,
only your IP address will be sent in the From header.
Insecure - This is a SIP parameter used to determine peer matching.
The setting determines whether or not an insecure connection will be
allowed, or if authentication is required. The valid options are:
–
port - Enter this value to match against only an IP address. This set-
ting is useful if you have multiple endpoints behind a NAT device.