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Section 3: Features
Product Description 129
3
To use the ISDN Two B-Channel Transfer, the system sends a Facility Message to the currently
active PRI trunk and then sets the retry timer (Program 24-02-09). The system will resend the Facil-
ity timer based on the retry timer. If there is no response after the 3rd resend, the system considers
the transfer as failed and stops resending.
When the transfer has succeeded, the telco sends the information to the system in the Facility, Dis-
connect or Release Message. When the system receives a Facility Message, it sends back Discon-
nect or Release then releases the trunks. When the system receives a Disconnect or Release, the
system simply releases the trunks (the other trunk will also receive a Disconnect or Release).
If the transfer fails, the telco sends the system Facility message with the fail information (some tel-
cos may send an Alerting, Disconnect or Release Message). In this case, the trunks are not trans-
ferred and remain in the system.
With this feature, the following conditions apply:
● Only manual transfers (such as pressing the Transfer key or going on-hook) are supported
with this feature. Aspire PRI trunks cannot perform a trunk-to-trunk transfer in the following
cases:
A. Pressing the Transfer (Program 15-07 or SC 851: 06) or CONF key while in a Conference
call with two trunks (Unsupervised Conference feature).
B. The incoming trunk call is automatically transferred to another trunk by system program-
ming (such as Call Forward Off-Premise).
● The bearer capability of the two calls must be “Speech, 3.1-kHz Audio, Unrestricted Digital
information” or compatible.
●
At least one call must have been answered. The other call must:
- have already received ALERT message if it is an outgoing call
OR
- already have been answered if it is an incoming call.
● The regular Tandem Trunking programming must also be set to enable this feature.
● This feature does not support S-Bus.
● When used with Aspire Networking, this feature will work only when the two trunks are in the
same system.