Eicon Networks ISDN NT1 Especificaciones descargar pdf (Pagina 17)

PBX manufacturers often extend or amend the rules for internal ISDN communications, so

the cause code returned may not be exactly the same as the international standard.

The point to note in the example given, is that neither the ISDN equipment, nor the public

network, nor the intended recipient, is the cause of the failed communication. Sending the

same fax call via a direct ISDN line would prove this.

Bear in mind also that the whole scenario could be repeated at the remote end of the

connection, with the supplier, the PBX, and the remote port, all needing to be aware of the

Bearer Capability being employed.

Summary

• The Bearer Capabilities required for a call need to be available throughout the

path of a call for the call to succeed.

• Diagnostic traces reveal Bearer Capabilities to assist problem identification.

Q/A

1. A fax call call might be designated as a generic analogue call or specifically as a fax call - true or false?

True.

A call originating from a fax machine directly connected to the ISDN network is likely to have 'Group 3 Fax'

as its call type.

A fax call originating on the PSTN network will not have any bearer capabilities to start with, and will get

allocated an automatic category of call type called 'Generic Analogue' by the ISDN network when the call is

transferred from the PSTN.

2. How can you find what Bearer Capabilities are specified on an incoming or outgoing call?

Diagnostic traces which send the progress of a call setup and disconnect to a readable log will reveal the

Bearer Capabilities of a particular call.

Eicon provide a utility with all their DIVA ISDN products called DiTrace which facilitates this process for

diagnosing problems.

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Eicon Networks ISDN NT1 Especificaciones Pagina 17