Mediatrix 1204
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C
H A P T E R
10
DNS SRV Configuration
This chapter describes the configuration required for the Mediatrix 1204 to work with a DNS SRV.
What is a DNS SRV?
Currently, one must either know the exact address of a server to contact it, or broadcast a question.
DNS SRV is an extension of the standard DNS server. SRV (Service Record) is a type of entry a network
administrator may put into the DNS answers. A DNS SRV is used to get one or more IP addresses of servers,
each one having its own weight and priority.
Each server received when using DNS SRV, depending on its weight and priority, can be used as a primary
or backup server or can be part of a load balancing system.
For instance, the client requests the SRV for SIP servers in some domain. The DNS server may return the A,
B, and C addresses, which are all SIP servers. Each address has a weight and the client must choose one of
those three addresses by using a random algorithm that considers the weight.
To use DNS SRV, an administrator must set a service records (SRV) into the DNS servers available on the
network.
DNS SRV implementation should imply a shared database between servers since a REGISTER and an
INVITE can be sent to any server, not necessarily the same one.
DNS SRV applies to both TCP and UDP transport types.
Priority vs Weight
A DNS SRV uses the
priority
and
weight
concepts to distribute the requests.
Standards Supported
•
RFC 2782 – A DNS RR for specifying the location of services
(DNS SRV)
•
RFC 3263 - Session Initiation Protocol (SIP): Locating SIP
Servers
Table 91:
Priority vs. Weight
Parameter
Description
Priority
A client must attempt to contact the target host with the lowest-numbered priority it can
reach.
Weight
Specifies a relative weight for entries with the same priority. Larger weights should be
given a proportionately higher probability of being selected.
Содержание Mediatrix 1204
Страница 6: ...Mediatrix Telecom a Division of Media5 Corporation Reference Manual...
Страница 26: ...Preface About this Manual End User Technical Support xxvi Mediatrix 1204...
Страница 27: ...Installation and Web Page Configuration...
Страница 28: ...Page Left Intentionally Blank...
Страница 50: ...Chapter 1 Installation Verifying the Installation 24 Mediatrix 1204...
Страница 98: ...Chapter 4 Web Interface SIP Parameters SIP Authentication 72 Mediatrix 1204...
Страница 127: ...SNMP Configuration...
Страница 128: ...Page Left Intentionally Blank...
Страница 162: ...Chapter 8 IP Address and Network Configuration Ethernet Connection Speed 136 Mediatrix 1204...
Страница 170: ...Chapter 9 SIP Servers Presence Compositor Server 144 Mediatrix 1204...
Страница 174: ...Chapter 10 DNS SRV Configuration DNS SRV Oriented Settings 148 Mediatrix 1204...
Страница 196: ...Chapter 12 Configuration File Download Configuration File Example 170 Mediatrix 1204...
Страница 220: ...Chapter 14 Gateway Configuration Detecting a Far End Disconnect 194 Mediatrix 1204...
Страница 240: ...Chapter 16 Voice Transmissions User Gain 214 Mediatrix 1204...
Страница 288: ...Chapter 23 Telephony Attributes Delayed Hot Line 262 Mediatrix 1204...
Страница 294: ...Chapter 25 Quality of Service QoS VLAN 268 Mediatrix 1204...
Страница 298: ...Chapter 26 Syslog Daemon Syslog Daemon Configuration 272 Mediatrix 1204...
Страница 302: ...Chapter 27 Statistics RTP Statistics 276 Mediatrix 1204...
Страница 319: ...Appendices...
Страница 320: ...Page Left Intentionally Blank...
Страница 332: ...Appendix B Standard Hardware Information Warranty 306 Mediatrix 1204...
Страница 336: ...Appendix C Cabling Considerations RJ 11 Telephone Cable 310 Mediatrix 1204...
Страница 372: ...Appendix E Glossary Wide Area Network WAN 346 Mediatrix 1204...
Страница 390: ...Index W 364 Mediatrix 1204...