An H.323 TelePresence system can successfully call a second H.323 TelePresence system but when connecting to a SIP TelePresence system video does not work. What is a possible reason for this problem?
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SIP and H.323 devices must be connected directly using IP addresses to prevent video corruption
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SIP and H.323 use different video protocols and cannot exchange video
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SIP to H.323 calls need to be routed through an H.320 gateway to support video
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The SIP-based device may not share a common video protocol with the H.323 devices