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Chapter 18 VoIP
Figure 375 SIP and H.248 Network Comparison
SIP
A
B
IP NETWORK
ANALOG
ANALOG
SIP ATA
SIP ATA
H.248
MGC
MG
IP NETWORK
ANALOG
C
D
The IES uses H.248 interfaces that consist of a "Signaling Card" (SC) and at least one "Media
Card" (MC). A VOP1248G-61 can act as either an SC, an MC, or both. The SC includes the
Media Gateway (MG) and acts as an H.248 signaling gateway. It terminates and processes
H.248 protocol messages from the MGC. An VOP1248G-61 in the MC role terminates RTP
packets and converts the payload into analog for the subscriber's phone. The MCs are also
known as an SC's slaves. The SC and MC can be in the same IES chassis for a centralized
deployment or in different chassis for a decentralized deployment. For increased reliability, the
SC can use a second MGC if it cannot reach the first MGC.
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MSC1000G/1024G/1224G Series User's Guide
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Troubleshooting
