User`s guide

System Administrator’s Guide – Release 7.2.3.x

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Revised: September 1, 2010

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call should be dead. Some FXO lines support a supplemental feature known as line-side answer supervision

where the network provides an explicit signal acknowledging that the far end has picked up during an

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 supports Direct Inward Dialing (DID). However, the E&M modes do support DID,

and are required if DID operation is 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.

Data Support

The Allworx server 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 a T1 interface 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.

Restrictions

Only one interface may be designated as the logical WAN interface for the 24x and 48x systems. 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 are

able to 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.

10.5.1 Configuration

The configuration of the Digital Lines is dictated by how the service provider provisions the line to which the

interface is. The settings must match the service provider’s expected configuration or improper operation will