1006 Direct Call - Packet

Direct Call is an optional Public Packet Switched Network (PPSN) feature 
which enables the calling Data Terminal Equipment (DTE) to automatically 
initiate a call request without supplying the called destination address.  

Generic Name of ONA Service 	Product Name		BSE or CNS
===========================================================================
Direct Call - Packet	AM - Packet - Direct Call 	CNS 
                    	BA - Auto Call Ports		CNS
                    	BS - Direct Call		CNS or BSE
                    	NX - Direct Call		CNS or BSE 
                    	PB - Direct Call		CNS
                    	SWB - Packet Direct Call	CNS
                    	USW - Auto Call			CNS 

FEATURE OPERATION:
The Direct Call feature allows the PPSN Access Concentrator (AC), or ISDN Packet
Handling Facility (PHF) to set up calls to a presubscribed address with minimal
input from the user.  The presubscribed address is established by the customer 
at the time the service is provisioned.  This address, which is assigned a 
logical channel number, is used in an originating call request whenever no 
called address is provided by the calling DTE.  

TECHNOLOGICAL AND FEATURE INTERACTION CONSIDERATIONS:
1. The PPSN Access Concentrator should support X.25 direct access and dial in
   interfaces.

2. The PPSN Access Concentrator should support asynchronous direct access and 
   dial in interfaces.

3. The ISDN Packet Handling Facility (PHF) should support the X.25 standard
   interface and future protocol requirements.

4. The ISDN default throughput class value is 9600 bps for all X.25
   interfaces.  The range of throughput class values that should be
   supported on all ISDN X.25 interfaces is: 75, 150, 300, 600, 1200, 2400,
   4800, and 9600 bps.  For B-channel and 64 kbps D-channel interfaces, the
   following throughput class values should be supported in addition: 19.2,
   48, 56 and 64 kbps (the last two values as soon as codepoints are
   assigned).

5. References:
   o PPSNGR TR-TSY-301, Issue 2, December 1988, Section 3.2.6.21.
   o CCITT 1980, 1984 and 1988 recommendations for X.25 and asynchronous
     interface requirements.

This service, if offered as a BSE, is associated with the Packet Switched X.25
basic serving arrangement.
