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Differences
This shows you the differences between two versions of the page.
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sip:locating_sip_services [2011/06/21 13:45] vopatek |
sip:locating_sip_services [2011/06/21 13:50] (current) vopatek |
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| DNS is the mechanism for determining the IP address, port and transport protocol of the host to which a SIP request is sent. | DNS is the mechanism for determining the IP address, port and transport protocol of the host to which a SIP request is sent. | ||
| - | DNS provides two different record types that controls SIP requests: SRV and NAPTR. The SRV record allows DNS administrators to use several servers for a single domain. The NAPTR record is a way for the called domain to specify which protocol it prefers a SIP request to use. | + | DNS provides two different record types that controls SIP requests: SRV and NAPTR. The SRV record allows DNS administrators to use several servers for a single domain. The NAPTR record is a way for the called domain to specify which protocol it prefers a SIP request to use.\\ |
| + | The usage of NAPTR and SRV for SIP is specified in [[http://www.ietf.org/rfc/rfc3263.txt|RFC3263]]. | ||
| ===== Setting up SRV Records ===== | ===== Setting up SRV Records ===== | ||
| Line 21: | Line 22: | ||
| | Service: _sip | The service is SIP. Can also be _sips for TLS encrypted communication. | | | Service: _sip | The service is SIP. Can also be _sips for TLS encrypted communication. | | ||
| - | | Protocol: _udp | The protocol is UDP.\\ Other values: _tcp or _sctp. | | + | | Protocol: _udp | The protocol is UDP. Other values: _tcp or _sctp. | |
| | Name: | | | | Name: | | | ||
| | Cache lifetime\\ 43200 | 43,200 seconds = 12 hours. | | | Cache lifetime\\ 43200 | 43,200 seconds = 12 hours. | | ||
| Line 53: | Line 54: | ||
| | Replacement:\\ _sip._tcp.company.com | This is the next domain-name to query for depending on the potential values found in the flags field.| | | Replacement:\\ _sip._tcp.company.com | This is the next domain-name to query for depending on the potential values found in the flags field.| | ||
| - | The SRV records are specified in [[http://www.ietf.org/rfc/rfc3403.txt|RFC3403]]. | + | The NAPTR records are specified in [[http://www.ietf.org/rfc/rfc3403.txt|RFC3403]]. |
