iPECS UCP600 - Page 116

iPECS eMG80/100& eMG800 & UCP & vUCP
Administration and Programming Manual Issue 2.5
102
The VOIP channels may be used for Distributed Networking, access to SIP or H.323 networks, and for remote
iPECS devices. When the standard H.323 VoIP protocol is employed for an external VoIP call, several
attributes of these channels can be assigned. The H.323 call set-up mode and tunneling (H.245
Encapsulation) can be established.
Also, for H.323 support, a RAS (Registration, Admissions, and Status) channel can be defined. The RAS
channel IP addresses (unicast and multicast), IP port Numbering Plan and other H.323 set-up characteristics
are defined.
This page also allows setting the IP TOS bit for Diffserv, a commonly recognized packet prioritization protocol.
Higher priority packets are given priority in the Default gateway or Layer 3 Switch queue. However, they are
the first to be discarded in the event of long queue delays, which may cause excess packet loss and poor
voice quality.
Refer to the following table for a description of the features and the input required.
Table 4.4.3.1-1 H.323 VOIP ATTRIBUTES
ATTRIBUTE
DESCRIPTION
RANGE
DEFAULT
H323 Setup Mode
IP calls can be set up using the H.323 normal or Fast Start
mode.
Normal/
Fast
Fast
H323 Tunneling
Mode
IP calls can be set up using the H.245 encapsulation
(Tunneling).
OFF
ON
ON
H323 Early Media
(early H245)
This feature allows two user endpoints to communicate before
a call is actually established in normal call mode. This feature
is not used when 'H323 Setup Mode' is 'Fast.'
 Setup: The caller party tries to open early media on
receiving the Setup message.
 Proceeding: Calling party tries to open early media on
receiving the Proceeding message.
 Alerting: Calling party tries to open early media on
receiving the Alerting message.
Refer to
description
H323 DTMF Path
During a call, DTMF can be sent in-band or out-of-band
(H.245)
Out-band, In-band, 2833
Refer to
description
In-band
DIFFSERV
This parameter sets Diff Serv pre-tagging for the Voice packet.
Note high values may cause high packet discard levels.
0~63
4
TCP Keep-Alive
The system will send a polling message every 75 seconds to
assure the status of the TCP connection.
OFF
ON
ON
Gatekeeper Attributes
RAS Usage
When this feature is ON, the VoIP channel is used as the
Gatekeeper.
OFF
ON
OFF
RAS Multicast IP
Port
This field defines the Multicast TCP/IP Port for RAS
Information of Gatekeeper.
TCP/IP
Port
1718
RAS Multi-cast IP
Address
This field defines the Multicast IP address for RAS Information
of Gatekeeper.
IP Address
224.0.1.41
RAS Uni-cast IP
Port
This parameter defines the Unicast IP Port for RAS Information
of Gatekeeper.
TCP/IP
Port
1719