Specifications

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Chapter 13: Topology – Network Services
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The H.323 gateways and ABC building blocks provide:
– Standard VoIP (H.323): G.711, G.723.1 and G.729A voice codecs and fax
– A high level of feature transparency (ABC protocol)
– Direct RTP between IP phones and distributed media gateways on different nodes to
minimize delay (no transit in the network)
– Ability for calls to overflow transparently to the ISDN/PSTN network when the IP WAN is
out of service or if IP trunks are saturated (See Call Admission Control chapter)