Welltech ePBX80 V.1.1 - Manual (Page 39)

Welltech Technology Co., Ltd. 39
Ext. party, he/she dials 700 to retrieve this hold call. Default is 700.
Call Park
Pool Enter Call Park Pool range. Default is 701 to 720.
Call Park
Time Input how much time to keep this Call Park. The call ring back to origin when call
park time was expiry.
Behind NAT
Behind NAT If your ePBX80 was installed behind NAT, we strongly suggest you to enable Behind
NAT to avoid any unexpected issues, such as “one way voice”.
External IP If you enter External IP address, ePBX80 will take that IP address as its argument.
If ePBX80 was installed behind NAT, the SIP header will normally use the private IP
address assigned to the server. The remote device does not know how to route back
to this address; therefore, it must be replaced with a valid, routable address.
Secondary
External IP This should cooperate with Default Gateway Backup in Network page. When Default
Gateway Backup is enabled, the ePBX80 will auto switch the default gateway to
secondary one if primary default gateway is broken. The External IP is not
functional when Backup Default Gateway is chosen. So you must enter the
Secondary External IP for Backup Default Gateway.
External
Host External Host takes a fully qualified domain name as its argument. If ePBX80 was
installed behind NAT, the SIP header will normally use the private IP address
assigned to the server. If you set up this option, ePBX80 will perform periodically
DNS lookups on the hostname and replace the private IP address with the IP
address returned from the DNS lookup.
Note: You should not set up both External IP and External Host together; otherwise
there will be some unexpected problems occurred. In other words, you can only
choose either External IP or External Host for “Behind NAT”.
Local Net Local Net is used to tell ePBX80 which IP address are considered local. If one of
calling party or receiving party is not under Local Net, ePBX80 will set up the
address in the SIP header that can be translated to that specified by External IP or
the IP address can be looked up with External Host. The format will be IP/ Subnet
Mask. Example: 192.168.1.0/ 255.255.255.0
Apply Click the Apply button to save your settings and exit this screen.
Cancel Click the Cancel button to give up change.