SIST ETS 300 403-1:1999/C1:1999

SLOVENSKI STANDARD
01-maj-1999
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Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one
(DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1:
Protocol specification [ITU-T Recommendation Q.931 (1993), modified]
Ta slovenski standard je istoveten z: ETS 300 403-1/C1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
35.100.30 Omrežni sloj Network layer
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CORRIGENDUM ETS 300 403-1
June 1996
Source: ETSI TC-SPS Reference: DE/SPS-05034-1-C1
ICS: 33.080, 35.100.30
ISDN, DSS1, layer 3
Key words:
This corrigendum modifies
the European Telecommunication Standard ETS 300 403-1 (1995)
Integrated Services Digital Network (ISDN);
Digital Subscriber Signalling System No. one (DSS1) protocol;
Signalling network layer for circuit-mode basic call control;
Part 1: Protocol specification
[ITU-T Recommendation Q.931 (1993), modified]
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Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
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© European Telecommunications Standards Institute 1996. All rights reserved.

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ETS 300 403-1: November 1995/Corrigendum: June 1996
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 403-1: November 1995/Corrigendum: June 1996
Foreword
This corrigendum corrects an editorial mistake in the modification of tables 3-4/Q.931 and 3-15/Q.931 in
ETS 300 403-1 (1995).
The maximum length of the Low layer compatibility information element is corrected to 18 octets as stated
in table 4-3 and clause ZA.2, item 23).
Amendments
The modifications of table 3-4/Q.931 and table 3-15/Q.931 shall read as follows (the correction is
highlighted using shading):
Page 13, table 3-4/Q.931
Modify table 3-4/Q.931 as follows:
Message type: CONNECT
Significance: global
Direction: both
Information element Reference Direction Type Length
Protocol discriminator 4.2 both M 1
Call reference 4.3 both M 2 - 3
Message type 4.4 both M 1
Bearer capability 4.5 both O (note 1) 4 - 12
Channel identification 4.5 both (note 2) O (note 3) 2 - 34
u → n
Progress indicator 4.5 both O (note 4) 2 - 4
Display 4.5 n → u O (note 5) 2 - 82
(note 6)
Date/time 4.6 O (note 7) 2 - 7
n → u
Signal 4.5 O (note 8) 2 - 3
n → u
Low layer compatibility 4.5 both O (note 9) 2 - 18
High layer compatibility 4.5 both O (note 10) 2 - 5
NOTE 1: The Bearer capability information element is included when the procedures of subclause
5.11 for bearer capability selection apply.
NOTE 2:    Included in the network-to-user direction for support of the procedures in annex D.
NOTE 3: Mandatory if this message is the first message in response to SETUP, unless the user
accepts the B-channel indicated in the SETUP message.
NOTE 4: Included in the event of interworking or in connection with the provision of in-band
information/patterns.
NOTE 5: Included if the network provides information that can be presented to the user.
NOTE 6: The minimum length is 2 octets; the maximum length is network dependent and is either 34
or 82 octets.
NOTE 7: As a network option, may be included to provide date and time information to the calling user
for all calls or for calls involving specific telecommunication services.
NOTE 8:    Included if the network optionally provides information describing tones.
NOTE 9: Included in the user-to-network direction when the answering user wants to return low layer
compatibility information to the calling user. Included in the network-to-user direction if the
user awarded the call included a Low layer compatibility information element in the
CONNECT message. Optionally included for low layer compatibility negotiation, but some
networks may not transport this information element to the calling user (see annex J).
NOTE 10: The High layer compatibility information element is included when the procedures of
subclause 5.12 for high layer compatibility selection apply.

Page 4
ETS 300 403-1: November 1995/Corrigendum: June 1996
Pages 22 and 23, table 3-15/Q.931
Modify table 3-15/Q.931 as follows:
Message type: SETUP
Significance: global
Direction: both
Information element Reference Direction Type Length
Protocol discriminator 4.2 both M 1
Call reference 4.3 both M 2 - 3
Message type 4.4 both M 1
Sending complete 4.5 both O (note 1) 1
Repeat indicator 4.5 both O (note 2) 1
Bearer capability 4.5 both M (note 3) 4 - 12
(note 20)
Channel identification 4.5 both O (note 4) 2 - 34
Progress indicator 4.5 both O (note 5) 2 - 4
Network specific facilities 4.5 both O (note 6) 2 - *
Display 4.5 n → u
...