Specifications

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AS/CA S002:2010 COPYRIGHT

OCTOBER 2010

APPENDIX

C AUTOMATIC STUTTER DIAL TONE DETECTION

C1 General

C.1.1 Line seizure for stutter dial tone detection

CE may automatically seize the line to detect the presence or

absence of stutter dial tone for the purposes of message wait

indication. Where CE performs this function it shall do so in

accordance with the requirements of this Appendix.

C.1.2 Conditions for automatic stutter dial tone detection

CE shall perform automatic stutter dial tone detection under one or

more of the following conditions:

(a) Perform periodic stutter dial tone detection in accordance

with Clause C3.

(b) Go ON-LINE to test for stutter dial tone no more than once

after a customer completes a call (outgoing or incoming), and

commence the check no earlier than 15 s after the PSTN line

has been released.

CE may go ON-LINE once to test for stutter dial tone after an

unanswered call not less than 5 min after the cessation of the

incoming ringing signal.

C2 Tone detection

C.2.1 Maximum duration

When performing an automatic stutter dial tone detection the CE

shall seize the line for a maximum duration of 4.0 s to test for stutter

dial tone.

Note: PSTN service tone characteristics are described in Appendix A.

C.2.2 Parallel connected CE

C.2.2.1 The CE shall incorporate a means of detecting line seizure by

parallel connected CE such that only a single line seizure occurs

when a stutter dial tone test is performed.

C.2.2.2 The CE should incorporate a means of detecting line seizure by

parallel connected CE so that only a single CE automatically seizes

the line to test for stutter dial tone. When initially configured for

automatic stutter dial tone testing, multiple CE may seize the line for

the first periodic detection interval but should not do so during

subsequent detection intervals.