System information

System Administration Guide

300 Main Street • East Rochester, NY 14445 • Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com

Revised: March 28, 2007

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outbound call. Because not all network equipment can produce this state, calls cannot rely upon it and the

state is ignored.

Neither of the FXO modes support Direct Inward Dialing (DID). However, the E&M modes do support DID,

and are required if DID operation desired. The other advantage of the E&M modes is that both of them are

symmetrical protocols and can be used to connect two PBX’s back-to-back, which is not possible with the

FXO configurations. To be clear, whichever mode is selected both ends must match and only E&M is

symmetrical.

The Allworx server supports the configuration of any of the above modes freely mixed on the T1 line for any

time slot, and also allows data to be delivered simultaneously as desired. This is commonly referred to a

fractional T1 line configuration. Additionally, while not commonly needed, PRI can be configured

simultaneously as well.

10.1.3 Data Support

The T1-A interface and T1-B interface can be configured to carry TCP/IP packets using PPP encapsulation

on any combination of slots constituting a full or fractional T1 interface. In fact, even when T1-A is configured

for circuit switched PRI operations, extra (non-voice) slots can be used for dedicated data connections as

long as the remote end service provider allows such a configuration.

Each T1 interface that has data slots configured on it constitutes a single logical serial channel using HDLC

encapsulation of PPP packets per RFC-1662. Even though any combination of slots can be used for data on

each Digital Line, only one logical data interface can be defined per T1 line.

To use a Digital Line as the system’s WAN interface (for Internet traffic, inter site, etc.), you must select the

Use a T1 port as the WAN interface option on the Network / Configuration / Modify page after you have

configured the T1 interfaces as desired.

Note: Even though Digital Lines can be configured and reconfigured without a system reboot, changes to

the Network Configuration settings do require a reboot after updating them.

Note: Since the data support is fully symmetrical it is possible to connect two Allworx server devices back to

back between their T1 interfaces either on the same site or across sites using a dedicated T1 line that

spans between two sites via the service provider.

10.1.4 Restrictions

Up through software release 6.5 of the Allworx server software, only one interface may be designated as the

logical WAN interface for the system. That is, only the Ethernet WAN port or one of the T1 interfaces may be

used for routing TCP/IP traffic. You must pick either Ethernet WAN, T1-A, or T1-B ports to be the data WAN

interface for the system even though you may provision multiple interfaces simultaneously. This restriction

will be removed in a future software release such that any combination of Ethernet interfaces or Digital Line

interfaces can be used as redundant/simultaneous WAN interfaces.

10.2 Configuration

The configuration of the Digital Lines is quite straightforward and most parameter settings are dictated by

how the service provider provisions the line that each interface is connected to. It is critically important that

the settings entered match the service provider’s expected configuration or improper operation will result.

Typically, you will want to fully configure the line or lines that are being used before physically making the

connections to the service provider’s point of demarcation.

Configuration Hint