Browse the glossary using this index
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E.123: E.123 is a recommendation for Notation for national and international telephone numbers provided by ITU-T.
A number in national E.123 format could be +49 7031 730090.
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E.164: The ITU-T standard that defines the world-wide PSTN numbering plan.
 E.164
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E1: ITU-T definition of a full duplex, 2.048Mbps physical interface. Set forth in recommendation G.703. Although E1 interface is used for ISDN PRI interfaces, E1 and PRI are not synonyms. |
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Early Media: Early Media is the ability of two terminals or user agents to communicate
before a call is established. Support for early media is important for interoperability with the PSTN.
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ECM: Error Correction Mode is a Fax protocol implementing re-transmission of corrupted page data to ensure flawless fax transmissions. Should always be enabled.
With traditional non-VoIP telephony systems, some people argued that ECM should be turned off. The reason was that if a fax is sent or received on a constantly bad line, no page would ever be sent without data corruption. In such a situation, ECM would retry the page a few times and then give up. However, nowadays, this is an unlikely scenario. As opposed to that, loosing data due to network packet loss is a pretty likely scenario - and it is perfectly fixed by using ECM.
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ENUM: ENUM (Electronic Number Mapping), is used for linking Telephony Number with special DNS entries.
 ENUM
Telephone number mapping |
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Ethernet: Todays most commonly used LAN technology. Ethernet |
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