User guide

Chapter 4—Configuring your VOIP
Multi-Tech Systems, Inc. 30
Field Name
Values
Description
phonebook of the local MultiVOIP and a matched setting in the Inbound Phonebook of
the remote VOIP.
Generate Local Dial
Tone
Y/N
Used for AutoCall only. If selected, dial tone will be generated locally while the call is
being established between gateways. The capability to generate dial tone locally
would be particularly useful when there is a lengthy network delay.
Offhook Alert
Timer
0 – 3000
seconds
The length of time that must elapse before the off hook alert is triggered and a call is
automatically made to the phone number listed in the Phone Number field.
Phone Number
--
Phone number used for Auto Call function or Offhook Alert Timer function. This phone
number must correspond to an entry in the Outbound Phonebook of the local
MultiVOIP and in the Inbound Phonebook of the remote MultiVOIP (unless a
gatekeeper unit is used in the VOIP system).
Dynamic Jitter
Dynamic Jitter
Buffer
Dynamic Jitter defines a minimum and a maximum jitter value for voice
communications. When receiving voice packets from a remote MultiVOIP, varying
delays between packets may occur due to network traffic problems. This is called
Jitter. To compensate, the MultiVOIP uses a Dynamic Jitter Buffer. The Jitter Buffer
enables the MultiVOIP to wait for delayed voice packets by automatically adjusting
the length of the Jitter Buffer between configurable minimum and maximum values.
An Optimization Factor adjustment controls how quickly the length of the Jitter
Buffer is increased when jitter increases on the network. The length of the jitter
buffer directly affects the voice delay between MultiVOIP gateways.
Minimum Jitter
Value
60 to 400
ms
The minimum dynamic jitter buffer of 60 milliseconds is the minimum delay that
would be acceptable over a low jitter network.
Default = 150 ms
Maximum Jitter
Value
60 to 400
ms
The maximum dynamic jitter buffer of 400 milliseconds is the maximum delay
tolerable over a high jitter network.
Default = 300 ms
Optimization
Factor
0 to 12
The Optimization Factor determines how quickly the length of the Dynamic Jitter
Buffer is changed based on actual jitter encountered on the network. Selecting the
minimum value of 0 means low voice delay is desired, but increases the possibility of
jitter-induced voice quality problems. Selecting the maximum value of 12 means
highest voice quality under jitter conditions is desired at the cost of increased voice
delay.
Default = 7.
Auto Disconnect
Automatic
Disconnection
--
The Automatic Disconnection group provides four options which can be used singly
or in any combination.
Jitter Value
1-65535
The Jitter Value defines the average inter-arrival packet deviation (in milliseconds)
before the call is automatically disconnected. The default is 300 milliseconds. A
higher value means voice transmission will be more accepting of jitter. A lower value
is less tolerant of jitter.
Inactive by default. When active, default = 300 ms. However, value must equal or
exceed Dynamic Minimum Jitter Value.
Call Duration
1-65535
Call Duration defines the maximum length of time (in seconds) that a call remains
connected before the call is automatically disconnected.
Inactive by default. When active, default = 180 sec.
This may be too short for some configurations, requiring upward adjustment.
Consecutive Packets
Lost
1-65535
Consecutive Packets Lost defines the number of consecutive packets that are lost
after which the call is automatically disconnected.
Inactive by default. When active, default = 30
Network Disconnection
1 to 65535;
Default =
30 sec.
Specifies how long to wait before disconnecting the call when IP network connectivity
with the remote site has been lost.