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- The Autodial
- Proudly Presents
-
- 'What happens when you call..'
-
- Preface:
- --------
- This file was written by information for the greater 408 & 415 area codes.
- Information contained in this file may not be accurate for all areas.
-
- The Local office:
- -----------------
- Assuming you want to call cousin Harry in New York, you would pick up the
- phone and dial. There is much more to it than that. When you pick up the
- phone, the voltage drops and the ESS send you dial tone. Now upon hearing the
- tone you proceed to dial '212-732-9087' the ESS recognizes the '212' as an out
- of area call, so it employs the ccis to place your call.
-
- The CCIS:
- ---------
- Now your end office checks the traffic on the long distance trunks and selects
- the least busy. Your ESS then signals the ESS in New York to call 212-732-9087.
- It does this by CCIS.. The following tones are sent from your ESS to New York's
- ESS 'KP-212-732-9087-ST'
-
- The End of the Connection:
- --------------------------
- After the above tones are recieved by New York A long Distance line is
- released to your end office by the CCIS Net COntrol. You hear a faint click or
- two in the entire three - five seconds it takes to place the call. You hear a
- ringing signal and the CCIS signals your end office to begin billing. Yes the
- ESS is designed to bill the calling party during the ringing.
-
- Line Home?:
- -------------
- Now supposing Uncle Harry is talking to someone. When the call hits his ESS,
- it (ESS) looks for a make busy flag. If it encounters one it then checks to see
- if Uncle has a make busy override flag (call waiting) if he does you hear a
- ring, if not you get a busy signal.
-
- A few words on Blue Boxes:
- --------------------------
- With the superfast trunk orders made by the CCIS & ESS blue boxing has become
- obsolete. Unless of course you happen to live in an area that is not owned by
- Bell or AT&T then you can box in and out of the lines faster than they
- (GTE,etc.) can. This is due to the fact that the other guys have to lease
- Bell's older, antiquated trunks which never were designed to handle ESS or CCIS.
-
- Foot Notes:
- -----------
- ESS = Electronic Switching System
- CCIS= Common Channel Intra-office signalling
- GTE = General telephone & electric
- (Sprint,Telenet,Sylvania.)
-
-
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