Technical Manual
U-SYS MRS6100 Media Resource Server
Chapter 5 MGCP and SIP
Huawei Technologies Proprietary
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the routing function rather than receive or reject calls. Cooperating with a registration
process, it can support the mobility of SIP terminals.
VIII. Registrar
Register is a server that accepts REGISTER requests. A registrar is typically
co-located with a proxy or redirect server. Registrar needs to store the address
mapping relationship in REGISTER requests in a database for subsequent call
processes. Registrar can also offer location services.
IX. User Agent (UA)
UA is a logical entity that can initiates or receive SIP requests.
X. User Agent Client (UAC)
UAC is a client application that initiates the SIP request. For example, SIP Phone is
an application of UAC.
XI. User agent server (UAS)
UAS is a client application that receives the SIP request. For example, MRS6100 is
an application of UAS.
The distinguishing of UAC and UAS is based on one transaction.
5.3.3 Protocol Stack
Figure 5-11 shows the protocol stack structure of IETF multimedia data and control
architecture.
H.323 SIP RTSP RSVP RTCP H.263 etc.
RTP
TCP UDP
IP
PPP
Sonet
AAL3/4 AAL5
ATM Ethernet
PPP
V.34
Figure 5-11 Protocol stack structure of IETF multimedia data and control architecture
SIP is part of the overall IETF multimedia data and control architecture, cooperating
with other protocols such as:
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