Cisco VG30D, Руководство пользователя

Страница: 36 / 118

4-8
Cisco VG30D Voice Gateway User Guide
OL-19276-01
Chapter 4 Management and Configuration
Q.931 Configuration
•
Initiate Link Establishment : This option determines how the link layer (layer 2) will be
established. Select Never if the connected equipment will always initiate link establishment. Select
Immediate if the Cisco VG30D Voice Gateway is to initiate the link, or select Call if the Cisco
VG30D Voice Gateway has only to establish the link if it has a call to deliver and the link layer has
not yet been established.
• Action on Layer 2 Reset : The Cisco VG30D Voice Gateway may react to a layer 2 reset or loss and
re-establishment of the link in three ways while calls are in progress. The response may be to Ignore
the layer 2 event, to send a Status message for each active call, or to send a Status Enquiry message
for each call.
•
Overlap Signalling Support : The support for overlap dialed calls can be configured to:
–
None when calls in both directions will be converted to en-bloc
– Incoming when incoming calls overlap, outgoing calls will be converted to en-bloc
–
Outgoing when outgoing call overlap, incoming calls will be converted to en-bloc, or
– Both Ways when all calls are treated as overlap calls.
Advanced Settings
Available settings include the following:
•
Layer 3 Protocol Profile : Select the protocol type from QSIG - (ETSI QSIG 1995), Euro-ISDN
(ETS300-403-1), AT&T TR-41449 , or ETSI (Generic Q.931).
• Service Message Supported : Valid only in TR41449 profile, if checked this flag controls the
response to a Service message with global call reference that is being received. The Cisco VG30D
Voice Gateway will respond with Service Ack message if option is enabled or a Status message with
cause of Message Not Implemented if disabled.
•
Call Reference Length : Setting allows the Cisco VG30D Voice Gateway to accept one-octet or
two-octet Call references. If Single is selected, the Cisco VG30D Voice Gateway will only send and
receive one octet length call references. If Double is selected, only call references that are two octets
in length will be deemed valid. When Both is selected, the Cisco VG30D Voice Gateway will accept
either length for incoming calls and generate two-octet Call References on outgoing calls.
•
Send Sending Complete Element : Unchecking the box allows the Sending Complete Information
Element to be suppressed in outgoing en-bloc calls.
• Send Connected Number Element : Unchecking the box allows the Connected Number
Information Element to be suppressed in outgoing Connect messages.
•
Enable Calling Line Id : Unchecking the box allows the Calling Party Number Information Element
to be suppressed in outgoing messages.
•
Connected Number Element Identifier : This setting allows the encoding to be selected according
to the connected network requirements. 76/0x0C provides compatibility with older TR41449
implementations that use that coding.
• Include Octet 3a in Connected Number : Checking this box will enable the transmission of
Presentation and Screening Indicators in Connected Number Information Elements.
•
Support Progress Indicator in Call Proc. and Disconnect : Checking this box will enable any
available progress information to be sent in Call Proceeding and Disconnect messages.
Note
Some types of networks do not support Progress Indicator in Call Proc. and Disconnect.