Lisa Bock covers DNS, an integral component of VoIP, which has Type A, AAAA, and service records that allows an IP phone to locate and connect with another host on the network.
- [Instructor] Every device that's connected to…the internet, such as a web or email server,…a VoIP phone, or other end device,…has an IP address.…Domain name system, or DNS,…maps a host name to an IP address…and works like the internet's phone book.…This enables devices to connect with one another.…Whenever you place a call to a SIP address,…the server will request the address from the DNS server.…
Once it's resolved, you can make the call.…With DNS, there are a number of…different types of resource records.…These resource records are used to specify a resource type…and an IP address to locate the resource.…Some commonly seen records are a type A record.…A type A resource record is used for…an IP version four address.…You might also see a quad A,…which is used for an IP version six address.…
A mail exchange record will redirect mail to a mail server.…And the last entry is a service record,…which defines available services…such as HTTP, LDAP, and SIP.…Similar to the way a mail exchange record…is used to send and receive mail,…
Author
Released
1/10/2019- Voice over IP (VoIP) and Unified Communications
- Digitizing a signal
- VoIP components
- Protocols used by VoIP, including TCP/IP and DHCP
- Connecting systems
- Gateways and gatekeepers
- Factors that might affect quality on a VoIP network
- Wireshark statistics
Skill Level Advanced
Duration
Views
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Introduction
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What you need to know4m 11s
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1. VoIP Overview
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Voice over IP (VoIP)2m 44s
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Digitizing a signal2m 48s
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VoIP components2m 34s
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2. Protocols
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TCP/IP2m 38s
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DHCP2m 46s
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Real-Time Transport Protocol5m 17s
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Real-Time Control Protocol5m 48s
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3. Connecting Systems
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Gateways and gatekeepers3m 8s
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MGCP and Megaco (H.248)4m 53s
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Session Initiation Protocol5m 32s
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H.323 family3m 4s
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H.323 demo7m 49s
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Translators and mixers2m 38s
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4. Network Operations
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Performance overview3m 26s
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Quality of service4m 39s
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Domain Name System2m 20s
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Directory integration1m 59s
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5. Wireshark Statistics
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VoIP calls6m 29s
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SIP flows and statistics5m 34s
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Multicast streams4m 31s
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Conclusion
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Next steps1m 25s
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Video: Domain Name System