Welltech ePBX40 V.2.0 - Manual (Page 57)

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[Pre-define]. Only those devices whose IP address or domain
name matched Pre-defined address allow to make a call.
Dial Plan Define Dial Plan for Trunk. It specifies the location of the
instruction used to control what dial out routes of the phone is
allowed to do for this Trunk. In this field, there are 6 dial levels
for Extension, including [from-pstn], [ext-only], [ext+R1],
[ext+R12], [ext+R123], [ext+allroutes]. You can define
an “Outgoing call” record, to certain route levels such as R1,
R2, R3 and R4. [from-pstn] is used to call FXO Trunk only.
[ext-only] means this subscriber can only call to Extension
only. [ext+R1] means the subscriber with such Dial Plan can
call to Extension and Route Level with R1. [ext+R12] means
the subscriber with such Dial Plan can call to Extension and
Route Levels with R1 and R2. [ext+R123] means the
subscriber with such Dial Plan can call to Extension and Route
Levels with R1, R2 and R3. [ext+allroutes] means the
subscriber with such Dial Plan can call to Extension and Route
Levels with R1, R2, R3 and R4.
Note: For more information about Route Level, please refer to
Chapter 3.2.7 Outgoing Routing.
NAT Traversal If the Trunk device was installed behind a device performing
NAT, such as firewall or router, and need to register to ePBX40
on public network. This function has to be enabled. Enable NAT
Traversal to force ePBX40 to ignore the contact information for
the SIP Trunk and use the address from which the signal
packets have been received.
Voice RTP packets were routed
through ePBX40 once there is a call ongoing.
Port To define the SIP signal port if you want to listen on a
nonstandard SIP signal port.
External Server
Address This field allows you to set up the domain name or IP address in
the SIP From URI. Set up this will avoid unexpected issues
happened if the service provider needs authentication.
Maximum Channels This command limits the maximum channels for this SIP Trunk
to dial out. For example, if you set up 2 at this field, only 2
outgoing calls could go out via this Trunk simultaneously.
Default is no limitation.
Outbound Caller ID Some service providers need to verify the correct registered
caller ID if they receive an incoming call. Default value of