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H.323 vs. SIP: Quality of Service
H.323v1 v2 v3 SIP
Call setup delay 6-7 RTT 3-4 1.5-2.5 1.5
Loss recovery TCP TCP better better
Fault detection yes yes yes yes
Mid-call failure fail fail fail live
Registrar failure fail fail backup multicast
GK/Proxy redundancy no no backup SLP, DNS, DHCP
Loop detection no no PathValue Via, hops, time
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