20.3.1 Distribution of the SwyxServer IP address to SwyxIt!
SwyxIt! receives the required IP address of the SwyxServer via DHCP/DNS.
Windows does not support the manufacturer-specific DHCP option 43. Please use the DNS method for distributing the SwyxServer addresses ( Configuration of DNS Server for SwyxIt!).
SwyxIt! needs the following information for the IP configuration:
*IP Address of the SwyxServer
DHCP Configuration of SwyxIt!
This information is transferred to SwyxIt! via DHCP:
ID (dec)
Name
Meaning
43
Vendor Specific Info
IP Address of the SwyxServer
Example:
If the IP address of SwyxServer is e. g. 10.20.30.40,
and the IP address of the standbySwyxServer 60.70.80.90 (obsolete)
The following byte sequence must then be entered:
decimal
73
80
80
66
88
83
82
86
10
20
30
40
60
70
80
90
hexadecimal
49
50
50
42
58
53
52
56
0a
14
1e
28
3d
48
50
5a
The beginning of the byte sequence (73, 80, 80, 66, 88, 83, 82, 86 which is equivalent to the string "IPPBXSRV") serves an identification purpose and it helps to prevent a misconfiguration if this option is used elsewhere.
 
Please note that the byte sequence for identification (73, 80, 80, 66, 88, 83, 82, 86 corresponds the string "IPPBXSRV") must always have eight bytes defined.
 
Configuration of DNS Server for SwyxIt!
In order for the terminal devices to contact the DNS server, they must know the IP address of the DNS server and the domain name for the request to the DNS server. This can be transmitted to the telephone per DHCP using the standard DHCP options or it can be entered into the telephone manually. The latter has the disadvantage that the DNS server IP address must be configured individually for each device in the network.
The SwyxIt! query of the DNS server is made via the DNS A record "ippbxsrv. <domain>", where <domain> stands for the Internet domain name (analog: "ippbxsrvfallback.<domain>" for FallbackSwyxServer). The answer of the DNS server then contains its IP address.
The DHCP options required for the use of the DNS server:
ID (dec)
Name
Meaning
6
DNS Option
DNS Server IP Address
15
Domain Name Option
Domain name of the Subnet
The dynamic query of the server information is supported by the clients in Windows 2000 or higher.