Welltech ePBX80 V.1.1 - Manual (Page 24)

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between 8000 to 9000. You registration IP devices has to
configure the same port number if you configure SIP port other
than 5060.
External Server
Address (i.e. SIP
Server or IP-PBX) This field is going to set up the domain name in the SIP From
URI . Setting up this to avoid from unexpected issues if the
service provider needs information for authentication.
Maximum Channels This feature limits the maximum channels for this Trunk. For
example, you set up 2 at this field; only 2 outgoing calls could
go through this Trunk. Default is no limitation maximum calls.
Outbound Caller ID Some service providers require the correct registered caller ID
if it received an incoming call. ePBX80 will send the Extension’s
caller ID to this Trunk as default value, if this field left empty.
Note:
 Normally, SIP From URI contains the Extension’s calling ID
and ePBX80’s IP address, but some ITSP ( SIP Server ) may
reject this call due to security consideration. You can
modify the Calling ID and IP/Domain in the fields of
[External Server Address] and [Outbound Caller ID] when
the call is going through ePBX80 to the Destination (Trunk)
to avoid such security issue.
 If you have installed a Welltech FXO gateway as the Trunk,
you can use the default Trunk number 888 and 889 as the
FXO’s register number.
 For the FXO gateway, you may simply configure these
fields: Trunk Number, Password, Host, Dial Plan,
Keypad, NAT Traversal and RTP Mode.
 If you set up the ITSP ( external SIP Server or IP-PBX ) as
the Trunk, you may need to set up the following
configuration : Port, External Server Address and
Outbound Caller ID.
Caller ID Display
Name When inbound call is coming from either external FXO Trunk or
IP trunk, such as 888. The caller ID Name will be the “PSTN
number” or “888”. Specify this field will be used as your desire
setting instead.
Comment You can enter a 20 bytes note for each Trunk here.
CLIR Support CLIR means "Caller Line Identification Restriction". This feature
is to hide the caller's number. For example, ext 101 call to ext
102. But 101 won’t like to show the caller ID to 102. So 101 can