2.7 Facilities and QOS Parameters

The X.25 Recommendations allow service providers to offer a number of optional facilities, that affect the way that calls are made and handled.

• Non-OSI extended addressing

• X.25 fast select request/indication with no restriction on response

• X.25 fast select request/indication with restriction on response

• X.25 reverse charging

• X.25 packet size negotiation

• X.25 window size negotiation

• X.25 network user identification

• X.25 Recognized Private Operating Agency selection

• X.25 Closed User Groups

• X.25 programmable facilities

• X.25 call deflection.

The following Quality of Service (QOS) parameters are available when writing OSI CONS applications:

• Throughput Class

• Minimum Throughput Class

• Target Transit Delay

• Maximum Acceptable Transit Delay

• Use of Expedited Data

• Protection

• Priority

• Receipt Acknowledgment