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2 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
SIP Overview
1
This example shows packet exchange between two SIP clients, also known as user agent clients
(UAC). Each message is labeled with the letter "F" and a number for reference by the text. The
session established between the two end clients is facilitated by the SIP proxy server. User1 "calls"
User2 using his/her SIP identity, a type of Uniform Resource Identifier (URI) called a "SIP URI." The
SIP URI is similar to an email address, typically containing a username and a host name. In this
case, it is sip:user1@brocade.com, where brocade.com is the domain of User1's SIP service
provider.
SIP is based on an HTTP-like request and response transaction model. Each transaction consists of
a request that invokes a particular method, or function, on the server, and at least one response. In
this example, the transaction begins with User1's SIP phone sending an INVITE request addressed
to User2's SIP URI. The INVITE request contains a number of header fields. The fields present in an
INVITE include a unique identifier for the call (Call-ID), the destination address, User1's address,
and information about the type of session that User1 wishes to establish with User2. The INVITE
(message F1 in Figure 1) would look like the following.
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP pcuser1.brocade.com;branch=dkDKdkDKdkDK1111
Max-Forwards: 50
To: User2 <sip:[email protected]>
From: User1 <sip:[email protected]>;tag=1122334455
Call-ID: [email protected]
CSeq: 123456 INVITE
Contact: <sip:[email protected]>
Content-Type: application/sdp
user1
IP Phone
user2
IP Phone
INVITE F1
INVITE F2
TRYING F3
RINGING F4
RINGING F5
200 OK F6
200 OK F7
ACK F8
MEDIA FLOW
BYE F9
OK F10
SIP Proxy Server
- 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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