system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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parameters corresponds to either a single tone, a dual tone, or an amplitude modulated tone. --------------------------------- Code Tone Type --------------------------------- 0 Single Tone 1 Dual Tone 2 Modulated Tone --------------------------------- Table A-4: Call Progress Tone Types A.5.3 General Functional Requirements UTD functionally combines a single tone detector and a dual/modulated tone detector into a single module. UTD combines the results of these detectors into a single result. UTD has the following requirements. 1. The DSP shall indicate that the first ringback has started after at least 400 ms of ringback like signal has been processed, as long as no other tone type is early detected. If more than one type of tone is early detected, the first ringback reporting shall be delayed until either cadence information disqualifies the other types, or tone precedence is used as a 'tie-breaker'. Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 28 2. The DSP shall indicate ringback has stopped when ringback is no longer detected. 3. The DSP shall indicate a busy tone has been detected after the requisite number of make and break intervals have been processed, and no other tone category is still a candidate for detection. 4. The DSP shall indicate a reorder tone has been detected after the requisite number of make and break intervals have been processed, and no other tone category is still a candidate for detection. 5. The DSP shall indicate a number unobtainable tone has been detected after the requisite number of make and break intervals have been processed, and no other tone category is still a candidate for detection. 6. In the event that more than one tone is a candidate for detection, detection is delayed until all characteristics that may disqualify any of the candidates are tested (for example, waiting for multiple cadence pairs to occur). If there is still more than one potential tone after all differentiating features have been exhausted, then the tone with the highest precedence is detected. Also, if the tone ceases prior to singling out one candidate tone, then the tone with the highest precedence is detected. Precedence is shown in Table A-3. 7. The DSP shall supply an early detect flag. This flag shall be valid after the detector has processed no more than 72 ms of a tone. If more than one tone category is early detected, then the early detect flag shall indicate the tone category with the highest precedence. 8. The DSP shall indicate that a modem has been detected if a single tone falls within the specified frequencies for modem tones, the minimum make interval has been exceeded while the average tone power is in excess of the minimum power requirement, and no other tone category is still a candidate for detection. 9. The DSP shall indicate that a FAX CNG tone has been detected if a single tone falls within the specified frequencies for a CNG tone, the requisite number of on/off cadences have been processed, and no other tone category is still a candidate for detection. 10. The DSP shall indicate that a SIT tone has been detected if at least two of the three segments of possible SIT tones have been detected for at least the minimum interval in excess of the minimum power requirement. Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 29 11. The DSP shall indicate that an Unknown tone has been detected when it has been determined that a tone has been detected that falls within the specified frequencies for an Unknown tone, the minimum duration has been exceeded, and the tone does not match and other category tones. A.5.3.1 TONE DETECTOR PERFORMANCE REQUIREMENTS A.5.3.1.1 Single Tones There are four types of parameters that shall be used to control single tone detection. The variation of each parameter shall be limited by the constraints listed in Table A-5. ------------------------------ Minimum Maximum -------------------------------------------------------------- Frequency 300 Hz 3300 Hz -------------------------------------------------------------- Bandwidth 0 Hz 1800 Hz -------------------------------------------------------------- Duration 100 msec 32760 msec -------------------------------------------------------------- Minimum Power Level -45 dBm 3 dBm -------------------------------------------------------------- Table A-5: Single Tone Detection Constraints The frequency detection range shall be specified the Frequency and Bandwidth parameters. Figure A-2 shows the relationship of these parameters. Note that the bandwidth specification is symmetric about the center frequency. The Frequency and Bandwidth parameters define a "must detect" range. The detector shall not use frequency criteria to reject any tones which are within the range specified Frequency/Bandwidth parameters. Tones whose frequencies are outside but
"""

Extract the exact clause related to "Ip Ownership Assignment" from the excerpt above.

assistant: Not found.