Mitel 6800 Series, Руководство администратора

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Advanced Operational Features
6-34
To use this format with the default dial plan terminator (#), the # sign required by Sylantro
as a delimiter should be represented as an escaped character by using the sequence %23.
The speeddial format for an external number that includes an optional billing code becomes:
• *50<billing code>%23<phone number>
NUMBERS NOT REQUIRING BILLING CODES
Billing codes are not required for the following two types of calls:
• Emergency calls (E911)
• Calls between extensions
CONFIGURABLE DNS QUERIES
The Domain Name System (DNS) is the way that Internet domain names are located and
translated into Internet Protocol addresses. A domain name is a meaningful and easy-to
remember identifier for an Internet address.
The lists of domain names and IP addresses are distributed throughout the Internet in a
hierarchy of authority within a database of records. There is usually a DNS server within close
proximity to your geographic location that maps the domain names in your Internet requests
or forwards them to other servers in the Internet.
The IP Phones may be configured to issue requests for DNS records using one of three
methods. In the first method, the IP phones issue requests for “
A
” records from the DNS server.
In the second method, the IP phones issue requests for “
SRV
” records from the DNS server.
In the third method, the IP phones issue requests for
NAPTR
records from the DNS server.
However, the IP phones do not use the
NAPTR
record to determine whether to use a secure
or insecure communication path (see the following table for a description of each method).
When the IP phone accesses the IP network, it issues a DNS lookup request to find the IP
address and port and then waits for a response from the DNS service that provides the IP
address and port.
You can configure the phone to use any one of these methods by entering the applicable
v
alue
in the configuration files:
Note:
Whether or not the phone will operate/communicate in a secure or insecure mode
is ONLY determined by the pre-provisioning of the phone (i.e. the .cfg file).
CONFIGURATION
FILE VALUE DNS SERVER
METHOD USED DESCRIPTION
0 A only The phone issues requests for “
A
” (Host IP Address) records
from the DNS server to get the IP address, and uses the
default port number of 5060.