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4 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
SIP Overview
1
SIP client registration
Registration is another common SIP operation. Registration is the means through which the SIP
domain's registrar server learns the current location of SIP clients (UAC). Upon initialization, and at
periodic intervals, the SIP clients send REGISTER messages to domain's SIP registrar server. The
REGISTER messages associate an individual SIP URI (sip:user@brocade.com) with the machine (IP
address) into which the user is currently logged. The registrar server writes this association to a
database, called the location service, where it can be used by the SIP proxy server of the domain.
Often, a registrar server and the location service for a domain are co-located with the proxy server
for that domain.
SIP terminology
This section describes terms and concepts that you might find useful when configuring SIP-LB.
Request-URI
Every SIP user has a URI. One SIP user calls another by setting the SIP URI of the latter in the
request message, (also called request-URI), which appears before all message headers.
UAC
A User Agent Client (UAC) is a logical entity that creates a new request. The role of UAC lasts only for
the duration of the transaction.
UAS
A User Agent Server (UAS) is a logical entity that generates a response to a SIP request. The
response accepts, rejects, or redirects the request.
Proxy server
An intermediary entity that acts as both a server and a client for the purpose of making requests on
behalf of other clients. A proxy server is primarily a router, which means its job is to ensure that a
request is sent to another entity nearer to the targeted user. A proxy interprets and, if necessary,
rewrites specific parts of a request message before forwarding it.
Redirect server
A redirect server is a user agent server that generates 3xx responses to requests it receives,
directing the client to contact an alternate set of URIs.
Registrar server
A registrar server accepts REGISTER requests and places the information it receives in those
requests into the location service for the domain it handles.
- ServerIron ADX 1
- Document History 2
- Contents 5
- About This Document 9
- Command syntax conventions 10
- Notice to the reader 11
- Related publications 11
- Web access 12
- E-mail and telephone access 12
- SIP Server Load Balancing 13
- SIP terminology 16
- SIP message headers 17
- Max-Forwards 18
- Sample deployment topologies 19
- RINGING F4 21
- Configuring SIP SLB 23
- Configuring health check 26
- Example 29
- Load Balancing SIP over TCP 31
- Call-ID3 33
- Call-ID1 34
- Rehashing the SIP hash table 38
- Debug commands 40
- SIP SLB command reference 42
- Sample configuration 43
- Transparent Cache Switching 45
- Stateful caching 47
- Sample Deployment Topologies 48
- TCS with spoofing 49
- TCS with destination NAT 49
- TCS with Source NAT 50
- VIPs with reverse proxy 51
- Configuring TCS 52
- Defining a cache server 53
- Enabling TCS 56
- Other TCS options 57
- Cache Route Optimization 58
- Enabling Destination NAT 62
- Configuring Source NAT 62
- Examples 64
- Distribution algorithm 66
- • Maximum connection rate 72
- Enabling FastCache 73
- Enabling remote cache 73
- Shutting down a cache server 74
- Passive FTP for TCS 75
- Traffic flow of passive FTP 76
- Topologies supported 76
- High availability support 77
- ServerIron ADX 2 78
- Policy based caching 79
- Show commands 81
- Content aware cache switching 82
- Setting up the CSW policies 84
- Configuring the cache servers 85
- This field... Displays 91
- Displaying cache information 95
- TCS information (Continued) 96
- Sample configurations 98
- Applying IP policies 99
- Defining the caches 99
- Defining the cache groups 100
- 53-1002435-01 101
- Policy-based caching 102
- Asymmetric TCS (FastCache) 103
- Policy-based cache failover 105
- TCS with reverse proxy 107
- Layer 3 TCS 109
- Basic TCS configuration 110
- Commands for ServerIron ADX A 111
- Commands for ServerIron ADX B 112
- Internet 114
- 10.10.20.104 114
- 10.10.20.102 114
- Router NI1 117
- Router NI2 117
- OSPF Area 0 117
- Commands for Router NI2 121
- Active-standby TCS 125
- Configuring Router R1 126
- Configuring ServerIron ADX A 126
- Configuring ServerIron ADX B 127
- NetCache servers 128
- NetCache C720 cache server 128
- TABLE 9 Hashing methods 130
- Parsing the host string 133
- Force rehash 136
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