Huawei U-SYS MRS6100 Technical Manual page 30

Technical Manual
U-SYS MRS6100 Media Resource Server
name but have different network addresses, such as IP addresses. Typically, the
gateway identifies a CA through its domain name. For lower-layer operations, the
gateway obtains the CA network addresses list from the domain name server (DNS),
and then uses an appropriate network address to communicate with the CA. The
redundancy mechanism is very helpful to enhance the reliability of the MRS6100.
Other entities, such as gateways and information servers, are also identified by their
domain names. Also, these entities can use the redundancy design to enhance the
reliability of the system. The CAs and gateways identify these entities through their
domain names.
With the domain names, you do not need to identify these entities using their network
addresses. The domain names are relatively stable while the network addresses can
be easily changed. For example, if an entity is moved to a different local access
network (LAN), the IP address of the entity will be changed. But you can keep using
the same domain name. The domain name lifetime ensures that other entities can
obtain the new IP addresses by updating the domain name information.
In the MGCP, CAs and other entities are represented by e-mail addresses.
For example:
Call-agent@ca.example.net represents the CA in the example network
Busy-signal@ann12.example.net represents the busy signal in the 12# information
server in the example network
IX. Events, signals, and packages
Events and signals are essential to the MGCP. The CA may ask to be notified about
certain events that occur at an endpoint, such as offhook, onhook, flash-hook, or
dialing. The CA may request certain signals to be applied to an endpoint, such as dial
tone, ring back tone, or busy tone.
Events and signals are integrated into packages. Each package is supported by a
specific endpoint.
An event is named in the following format:
Package name/event name
In the name, the package name is optional because each type of endpoint has a
related default package. If the package name is not included in the name, the default
package name is used.
The symbol @ with the event connection can be added after the event name. you can
also use the event range and a wildcard to indicate an event name. the wildcard *
represents "all" while the wildcard $ represents "current or any".
Each signal has an associated signal type, such as on/off (OO), timeout (TO), and
brief (BR).
Table 5-1 lists some basic packages.
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5-5
Chapter 5 MGCP and SIP