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H323-BCH (H.323 B Channel)
Issue 1 June 2005 1313
H323-BCH (H.323 B Channel)
S8700 | 8710 / S8500 / S8300
No maintenance diagnostic tests exist for this object.
H.323 signaling is similar to ISDN Q.931 signaling. In order to take advantage of existing ISDN
Avaya™ Communication Manager, H.323 trunk AvayaCommunication Manager software
includes H.323 signaling groups, H.323 D channels and H.323 B channels. H.323 signaling
groups are similar in concept to ISDN PRI signaling groups. H.323 D-channels are an artificial
fabrication created only to allow maximum re-use of system ISDN code. H.323 B channels are
also an artificial fabrication.
No physical hardware components make up the H.323 B-channel object discussed here. Along
with the D channel, these objects allow existing ISDN Communication Manager software to be
re-used for H.323 trunking. The H.323 signaling group is not a collection of physical D-channels
that exist on one or more DS1 facilities. The H.323 signaling group can be considered to be one
D channel that physically rides on a C-LAN port (IP_PROCR port in an S8300 system) and the
IP network. Unlike ISDN D-channels, the H.323 D channel may come up and down on a
call-by-call basis. So, the H.323 D channel is actually a TCP/IP signaling channel. Layer 1 and 2
of this signaling channel may be monitored by IP PING testing.
Performance in terms of voice latency for a signaling group is monitored by background
measurements collected by the Media Processor board.
H.323 B channels use Media Processor ports to carry the actual bearer. The Media Processor
port is a service circuit. On a call-by-call basis, any port of a media processor may be serving an
H.323 station or an H.323 B channel. Status information may exist for a specific H.323 B
channel, and an H.323 B channel may be busied out and released, but no maintenance
diagnostic tests will exist for the object.
Errors are logged for craft busyout conditions. The system receives service state updates for
craft-driven busyout/release. Under normal conditions the system automatically places H.323 B
channels into or out of service when it receives an H.323 signaling-group service state update.
Craft busyout drops active calls.
Error Log Entries and Test to Clear Values
Note:
a. *Error Type 18: Indicates that this specific H.323 trunk group member has been craft
busied-out.
Table 454: H323-BCH B-Channel Error Log Entries
Error
Type
Aux
Data
Associated Test Alarm
Level
On/Off
Board
Service
State
18 (a) Any B-channel busied out Warning off OOS