User guide

Chapter 12: Trunk Configuration
MAXCS ACC 6.7.1 Administration Manual 143
3. If PRI trunk channel has area code and caller ID configured, this number will be
transmitted. If not configured, go to next.
4. PRI will transmit the system home area code and main number defined in
System Configuration, General tab.
• Description – Descriptive information such as the company name for the assigned
Phone Number, or appropriate agency if this trunk provides 911 access.
• Trunk Dialing Scheme – Overlap or En-bloc dialing.
• Overlap - Transmitting dialed DTMF digits to the CO without buffering digits in
the system first. Use Overlap dialing for analog and T1-CAS trunks for best
results. Calls will be completed faster.
• En-bloc - The system will buffer all dialed digits and send it to the CO at once.
Typically is used in ISDN-PRI trunk and SIP trunk.
Note: For IP tie trunks, use the IP Dialing Table in AltiEnterprise Manager to set the
dialing scheme (AltiEnterprise Manager is available by selecting VoIP >
Enterprise Network Management, or from the Windows Start menu).
• Trunk Call Predial String – To have the system automatically insert the configured
digits whenever the selected trunk is used for outgoing calls. This feature is used to
prevent having to dial “9” twice for trunk access when the system is used behind
another PBX system or this trunk is a Centrex line, which requires dialing “9” to make
a call. If you select this option, type the predial digit(s) into the text box.
• Enable Centrex Transfer – When checked, the system is able to transfer an in-
coming call to another outside number through the same trunk and release the in-
coming trunk. Before you configure this option for the trunk, please make sure your
trunk is a Centrex line or supports the Release Line Transfer (RLT) feature. Depend
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ing on the type of trunk, your configuration may be different:
• If this is an analog Centrex line, you only need to check the Enable Centrex
Transfer check box. A FLASH signal will be transmitted to the CO if the incom
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ing trunk call needs to be transferred to an outside number.
• If this is a T1-CAS trunk, you may need to add “transfer predial string.” From
the CO point of view, it is their feature code to initiate RLT. Please check with
your carrier to get the specification.
• If this is a PRI trunk, you need to ask your carrier if they support RLT through
DTMF. Some carriers accept *8 to signal RLT. AltiGen PRI trunks currently do
not support 2-B channel transfer feature.
How to signal AltiServ that it is a Centrex transfer:
• If a call is connected to an extension, the extension user needs to dial
FLASH * plus trunk access code and the outside number.
• If a virtual extension forwarding or speed dialing number is configured to an
outside number and the extension user transfers a call to the virtual extension
or speed dialing number, the system will add the Centrex FLASH automatically.
You don’t need to add the “*” in the forwarding or speed dialing digit stream.
• Attribute – In Service makes the trunk available for use. Out of Service prevents
the trunk from being used (for example, while performing maintenance).
• Enable Tie Trunk – This configuration field is meaningful only if you use T1 or PRI
to connect two AltiServ systems back-to-back. Do not check this box if you connect
an AltiServ to a third-party PBX via T1 or PRI trunk.
When this configuration is checked, the system software will interpret the incoming
[ANI] [DNIS] digit sequence as [Caller’s Extension Number] and [Target Extension