User's Manual 512 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Note:
• 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.
22.6.4 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 (Monitor menu > PSTN Status tab
> NFAS Group & D-Channel Status).
2. Select the required NFAS group, and then click the Switch Activity button.
Note:
• 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.
22.7 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
512)
Interworks ISDN overlap dialing with SIP, according to RFC 3578 (see 'Interworking
ISDN Overlap Dialing with SIP According to RFC 3578' on page
513)
Note: ISDN overlap dialing is applicable to PRI and BRI.
22.7.1 Collecting ISDN Digits and Sending Complete Number in SIP
The device can support an overlap dialing mode whereby the device collects the called
party number digits from ISDN Q.931 Information messages or DTMF signals, and then
sends a SIP INVITE message to the IP side containing the complete destination number.
ISDN overlap dialing for incoming ISDN calls can be configured for the entire device or per
ISDN trunk. This is configured using the global, ISDNRxOverlap parameter or the
ISDNRxOverlap_x parameter (where x denotes the trunk number), respectively.
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