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One hundred users are connected to a SIP IP system and experience busy signals about half of the time when trying to make a call to the public switched telephone network (PSTN). Internal calls are working fine. Which of the following could be the reason?

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One hundred users are connected to a SIP IP system and experience busy signals about half of the time when trying to make a call to the public switched telephone network (PSTN). Internal calls are working fine. Which of the following could be the reason?






 
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