Info from the AAEP online help section:
Customer is required to tweak the both UDP and H.323 station range as well if they have limited UDP ports.
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UDP
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The range of port numbers used by User Datagram Protocol (UDP) transactions.
Enter the lower value of the range of port numbers in the Lowfield, and the higher value in the High field. The range must be within 1024 to 65535.
The default range is 11000 to 30999.
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Note
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Each call that uses ASR and TTS resources requires a total of six UDP ports.
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H.323 Station
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The H.323 Station port range configures a range of UDP ports that are used exclusively for gatekeeper discovery and registration. However, the bulk of H.323 communication occurs over a TCP socket that is allocated from the TCP range. For each H.323 station, you need to configure one UDP and one TCP port. If either port fails to be allocated, the H.323 station will be marked out of service.
Enter the lower value of the range of port number in the Lowfield, and the last number of the range in the High field. The range must be within 1024 to 65535.
The default range is 37000 to 39499.
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Important
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The H.323 Station range must not overlap with UDP range.
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