What is the significance of a SIP proxy being 'transaction stateful' versus 'dialog stateful'?
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A
Transaction stateful proxies track individual SIP transactions while dialog stateful proxies track the full call lifecycle
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B
Transaction stateful proxies only handle INVITE while dialog stateful proxies handle all methods
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C
Transaction stateful proxies use TCP only while dialog stateful proxies support UDP
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D
Transaction stateful proxies require TLS while dialog stateful proxies do not