单选题Which IP telephony deployment model uses an H.225 Gatekeeper-Controlled trunk for calladmission control within existing H.323 environments？（）A single site with centralized call processingB single site with distributed call processingC multisite with centralized call processingD multisite with distributed call processing
单选题
Which IP telephony deployment model uses an H.225 Gatekeeper-Controlled trunk for calladmission control within existing H.323 environments？（）
A
single site with centralized call processing
B
single site with distributed call processing
C
multisite with centralized call processing
D
multisite with distributed call processing
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