IP Server 900 Programming Manual Function 8: IP programming
L.3
A note about automatic IP address assignment
When you first assign an IP station in Function 31 (extension assignment) by using EHCP
1
, the system will
automatically set an IP address to that station based on the IP/ASC IP address assigned in Function 821.
You may override that IP address with another (for example, if assigning a remotely connected ESI desktop
IP phone or Remote IP Cordless Handset). If this occurs, the “automatic” IP address that would have been
assigned will remain unused, and will be used when assigning the next IP station.
Important: All IP/ASC IP addresses, DSP IP addresses, the NSP IP address, and the Software Assurance IP
address must be connected to the same network!
The IP addressing assigned to the rest of the system based upon Function 821 is dependant upon both the
size of the subnet assigned and the EXTERNAL DHCP setting in Function 823. By default Function 823’s
EXTERNAL DHCP field is set to NO, which means the system will assign addresses using EHCP. In this
configuration the system assigns addresses as follows:
• Function 821 assigns the IP address and subnet for Master Control Unit’s IP/ASC.
• The EHCP pool used for ESI IP phone and SIP phone addresses is then created, and will begin at .100 of
the network the Carrier Card is on, if available. If .100 is not available, .200 will be used instead. For
example, if the MCU IP/ASC is assigned 10.0.0.1, then the EHCP pool will begin at 10.0.0.100; if the
Carrier Card is assigned 10.0.0.100, then the EHCP pool will begin at 10.0.0.200. The pool’s end address
is automatically incremented each time a new IP phone is assigned in Function 31, and is incremented
based on the subnet as defined in RFC 796.
2
Note: If EXTERNAL DHCP is set to YES in Function 823 then EHCP will be disabled for SIP Stations and
function only for ESI IP phones.
Note: If the IP address and subnet combination assigned restricts the number of available addresses to fewer
than the number needed to auto-populate the remainder of devices the system will only be able to auto-
populate addresses for the remainder of the subnet.
1
ESI Host Configuration Protocol.
2
See ftp://ftp.rfc-editor.org/in-notes/rfc796.txt.
To Next Page
Loading...
