Creating An Nfas-Related Trunk Configuration; Performing Manual D-Channel Switchover In Nfas Group; Isdn Overlap Dialing - AudioCodes Mediant 1000B User Manual

21.6.3 Creating an NFAS-Related Trunk Configuration

The procedures for creating and deleting an NFAS group must be performed in the correct
order, as described below.

To create an NFAS Group:
1. If there's a backup ('secondary') trunk for this group, it must be configured first.
2. Configure the primary trunk before configuring any NFAS ('slave') trunk.
3. Configure NFAS ('slave') trunks.

To stop / delete an NFAS Group:
1. Stop or delete (by setting ProtocolType to 0, i.e., 'None') all NFAS ('slave') trunks.
2. Stop or delete (by setting ProtocolType to 0, i.e., 'None') the backup trunk if a backup
trunk exists.
3. Stop or delete (by setting ProtocolType to 0, i.e., 'None') the primary trunk.
Notes:
•
All trunks in the group must be configured with the same values for trunk
parameters TerminationSide, ProtocolType, FramingMethod, and LineCode.
•
After stopping or deleting the backup trunk, delete the group and then reconfigure
it.

21.6.4 Performing Manual D-Channel Switchover in NFAS Group

If an NFAS group is configured with two D-channels (Primary and Backup), you can do a
manual switchover between these D-channels.

To manually switchover from active to standby D-channel:
1. Open the NFAS Group & D-Channel Status page (Status & Diagnostics tab > VoIP
Status menu > NFAS Group & D-Channel Status).
2. Select the required NFAS group, and then click the Switch Activity button.
Notes:
•
The Switch Activity button is unavailable (i.e, grayed out) if a switchover cannot
be done due to, for example, alarms or unsuitable states.
•
This feature is applicable only to T1 ISDN protocols supporting NFAS, and only if
the NFAS group is configured with two D-channels.
21.7

ISDN Overlap Dialing

Overlap dialing is a dialing scheme used by several ISDN variants to send and/or receive
called number digits one after the other (or several at a time). This is in contrast to en-bloc
dialing in which a complete number is sent in one message.
The device supports the following ISDN overlap dialing methods:

Collects ISDN called party number digits and then sends the SIP INVITE to the IP side
with the complete destination number (see ''Collecting ISDN Digits and Sending
Complete Number in SIP'' on page 349)

Interworks ISDN overlap dialing with SIP, according to RFC 3578 (see ''Interworking
ISDN Overlap Dialing with SIP According to RFC 3578'' on page 350)
User's Manual
Mediant 1000B Gateway & SBC
348 Document #: LTRT-27034